#include <StringDictionary.h>

Collaboration diagram for StringDictionary:

Classes
struct	compare_cache_value_t

struct	PayloadString

class	StringCallback

struct	StringIdxEntry

Public Member Functions
	StringDictionary (const DictRef &dict_ref, const std::string &folder, const bool isTemp, const bool recover, const bool materializeHashes=false, size_t initial_capacity=256)

	StringDictionary (const LeafHostInfo &host, const DictRef dict_ref)

	~StringDictionary () noexcept

int32_t	getDbId () const noexcept

int32_t	getDictId () const noexcept

void	eachStringSerially (int64_t const generation, StringCallback &) const

std::function< int32_t(std::string const &)>	makeLambdaStringToId () const

int32_t	getOrAdd (const std::string &str) noexcept

template<class T , class String >
size_t	getBulk (const std::vector< String > &string_vec, T *encoded_vec) const

template<class T , class String >
size_t	getBulk (const std::vector< String > &string_vec, T *encoded_vec, const int64_t generation) const

template<class T , class String >
void	getOrAddBulk (const std::vector< String > &string_vec, T *encoded_vec)

template<class T , class String >
void	getOrAddBulkParallel (const std::vector< String > &string_vec, T *encoded_vec)

template<class String >
void	getOrAddBulkArray (const std::vector< std::vector< String >> &string_array_vec, std::vector< std::vector< int32_t >> &ids_array_vec)

template<class String >
int32_t	getIdOfString (const String &) const

std::string	getString (int32_t string_id) const

std::pair< char *, size_t >	getStringBytes (int32_t string_id) const noexcept

size_t	storageEntryCount () const

std::vector< int32_t >	getLike (const std::string &pattern, const bool icase, const bool is_simple, const char escape, const size_t generation) const

std::vector< int32_t >	getCompare (const std::string &pattern, const std::string &comp_operator, const size_t generation)

std::vector< int32_t >	getRegexpLike (const std::string &pattern, const char escape, const size_t generation) const

std::vector< std::string >	copyStrings () const

std::vector< std::string_view >	getStringViews () const

std::vector< std::string_view >	getStringViews (const size_t generation) const

std::vector< int32_t >	buildDictionaryTranslationMap (const std::shared_ptr< StringDictionary > dest_dict, StringLookupCallback const &dest_transient_lookup_callback) const

size_t	buildDictionaryTranslationMap (const StringDictionary dest_dict, int32_t translated_ids, const int64_t source_generation, const int64_t dest_generation, const bool dest_has_transients, StringLookupCallback const &dest_transient_lookup_callback, const std::vector< StringOps_Namespace::StringOpInfo > &string_op_infos) const

bool	checkpoint () noexcept

bool	isClient () const noexcept

void	update_leaf (const LeafHostInfo &host_info)

Static Public Member Functions
static void	populate_string_ids (std::vector< int32_t > &dest_ids, StringDictionary dest_dict, const std::vector< int32_t > &source_ids, const StringDictionary source_dict, const std::vector< std::string const * > &transient_string_vec={})
	Populates provided `dest_ids` vector with string ids corresponding to given source strings. More...

static void	populate_string_array_ids (std::vector< std::vector< int32_t >> &dest_array_ids, StringDictionary dest_dict, const std::vector< std::vector< int32_t >> &source_array_ids, const StringDictionary source_dict)

Static Public Attributes
static constexpr int32_t	INVALID_STR_ID = -1

static constexpr size_t	MAX_STRLEN = (1 << 15) - 1

static constexpr size_t	MAX_STRCOUNT = (1U << 31) - 1

Private Member Functions
void	processDictionaryFutures (std::vector< std::future< std::vector< std::pair< string_dict_hash_t, unsigned int >>>> &dictionary_futures)

size_t	getNumStringsFromStorage (const size_t storage_slots) const noexcept

bool	fillRateIsHigh (const size_t num_strings) const noexcept

void	increaseHashTableCapacity () noexcept

template<class String >
void	increaseHashTableCapacityFromStorageAndMemory (const size_t str_count, const size_t storage_high_water_mark, const std::vector< String > &input_strings, const std::vector< size_t > &string_memory_ids, const std::vector< string_dict_hash_t > &input_strings_hashes) noexcept

int32_t	getOrAddImpl (const std::string_view &str) noexcept

template<class String >
void	hashStrings (const std::vector< String > &string_vec, std::vector< string_dict_hash_t > &hashes) const noexcept

int32_t	getUnlocked (const std::string_view sv) const noexcept

std::string	getStringUnlocked (int32_t string_id) const noexcept

std::string	getStringChecked (const int string_id) const noexcept

std::pair< char *, size_t >	getStringBytesChecked (const int string_id) const noexcept

template<class String >
uint32_t	computeBucket (const string_dict_hash_t hash, const String &input_string, const std::vector< int32_t > &string_id_string_dict_hash_table) const noexcept

template<class String >
uint32_t	computeBucketFromStorageAndMemory (const string_dict_hash_t input_string_hash, const String &input_string, const std::vector< int32_t > &string_id_string_dict_hash_table, const size_t storage_high_water_mark, const std::vector< String > &input_strings, const std::vector< size_t > &string_memory_ids) const noexcept

uint32_t	computeUniqueBucketWithHash (const string_dict_hash_t hash, const std::vector< int32_t > &string_id_string_dict_hash_table) noexcept

void	checkAndConditionallyIncreasePayloadCapacity (const size_t write_length)

void	checkAndConditionallyIncreaseOffsetCapacity (const size_t write_length)

template<class String >
void	appendToStorage (const String str) noexcept

template<class String >
void	appendToStorageBulk (const std::vector< String > &input_strings, const std::vector< size_t > &string_memory_ids, const size_t sum_new_strings_lengths) noexcept

PayloadString	getStringFromStorage (const int string_id) const noexcept

std::string_view	getStringFromStorageFast (const int string_id) const noexcept

void	addPayloadCapacity (const size_t min_capacity_requested=0) noexcept

void	addOffsetCapacity (const size_t min_capacity_requested=0) noexcept

size_t	addStorageCapacity (int fd, const size_t min_capacity_requested=0) noexcept

void *	addMemoryCapacity (void *addr, size_t &mem_size, const size_t min_capacity_requested=0) noexcept

void	invalidateInvertedIndex () noexcept

std::vector< int32_t >	getEquals (std::string pattern, std::string comp_operator, size_t generation)

void	buildSortedCache ()

void	insertInSortedCache (std::string str, int32_t str_id)

void	sortCache (std::vector< int32_t > &cache)

void	mergeSortedCache (std::vector< int32_t > &temp_sorted_cache)

compare_cache_value_t *	binary_search_cache (const std::string &pattern) const

Private Attributes
const DictRef	dict_ref_

const std::string	folder_

size_t	str_count_

size_t	collisions_

std::vector< int32_t >	string_id_string_dict_hash_table_

std::vector< string_dict_hash_t >	hash_cache_

std::vector< int32_t >	sorted_cache

bool	isTemp_

bool	materialize_hashes_

std::string	offsets_path_

int	payload_fd_

int	offset_fd_

StringIdxEntry *	offset_map_

char *	payload_map_

size_t	offset_file_size_

size_t	payload_file_size_

size_t	payload_file_off_

std::shared_mutex	rw_mutex_

std::map< std::tuple < std::string, bool, bool, char >, std::vector< int32_t > >	like_cache_

std::map< std::pair < std::string, char > , std::vector< int32_t > >	regex_cache_

std::map< std::string, int32_t >	equal_cache_

DictionaryCache< std::string, compare_cache_value_t >	compare_cache_

std::shared_ptr< std::vector < std::string > >	strings_cache_

std::unique_ptr < StringDictionaryClient >	client_

std::unique_ptr < StringDictionaryClient >	client_no_timeout_

char *	CANARY_BUFFER {nullptr}

size_t	canary_buffer_size = 0

Friends
class	StringLocalCallback

Detailed Description

Definition at line 54 of file StringDictionary.h.

Constructor & Destructor Documentation

StringDictionary::StringDictionary	(	const DictRef &	dict_ref,
		const std::string &	folder,
		const bool	isTemp,
		const bool	recover,
		const bool	materializeHashes = `false`,
		size_t	initial_capacity = `256`
	)

Definition at line 117 of file StringDictionary.cpp.

References addOffsetCapacity(), addPayloadCapacity(), threading_serial::async(), CHECK_EQ, heavyai::checked_mmap(), anonymous_namespace{StringDictionary.cpp}::checked_open(), collisions_, heavyai::file_size(), getNumStringsFromStorage(), getStringFromStorage(), hash_cache_, anonymous_namespace{StringDictionary.cpp}::hash_string(), INVALID_STR_ID, isTemp_, LOG, materialize_hashes_, offset_fd_, offset_file_size_, offset_map_, offsets_path_, payload_fd_, payload_file_size_, payload_map_, processDictionaryFutures(), anonymous_namespace{StringDictionary.cpp}::round_up_p2(), rw_mutex_, str_count_, string_id_string_dict_hash_table_, VLOG, and logger::WARNING.

     : dict_ref_(dict_ref)
     , folder_(folder)
     , str_count_(0)
     , string_id_string_dict_hash_table_(initial_capacity, INVALID_STR_ID)
     , hash_cache_(initial_capacity)
     , isTemp_(isTemp)
     , materialize_hashes_(materializeHashes)
     , payload_fd_(-1)
     , offset_fd_(-1)
     , offset_map_(nullptr)
     , payload_map_(nullptr)
     , offset_file_size_(0)
     , payload_file_size_(0)
     , payload_file_off_(0)
     , strings_cache_(nullptr) {
   if (!isTemp && folder.empty()) {
     return;
   }
 
   // initial capacity must be a power of two for efficient bucket computation
   CHECK_EQ(size_t(0), (initial_capacity & (initial_capacity - 1)));
   if (!isTemp_) {
     boost::filesystem::path storage_path(folder);
     offsets_path_ = (storage_path / boost::filesystem::path("DictOffsets")).string();
     const auto payload_path =
         (storage_path / boost::filesystem::path("DictPayload")).string();
     payload_fd_ = checked_open(payload_path.c_str(), recover);
     offset_fd_ = checked_open(offsets_path_.c_str(), recover);
     payload_file_size_ = heavyai::file_size(payload_fd_);
     offset_file_size_ = heavyai::file_size(offset_fd_);
   }
   bool storage_is_empty = false;
   if (payload_file_size_ == 0) {
     storage_is_empty = true;
     addPayloadCapacity();
   }
   if (offset_file_size_ == 0) {
     addOffsetCapacity();
   }
   if (!isTemp_) {  // we never mmap or recover temp dictionaries
     payload_map_ =
         reinterpret_cast<char*>(heavyai::checked_mmap(payload_fd_, payload_file_size_));
     offset_map_ = reinterpret_cast<StringIdxEntry*>(
         heavyai::checked_mmap(offset_fd_, offset_file_size_));
     if (recover) {
       const size_t bytes = heavyai::file_size(offset_fd_);
       if (bytes % sizeof(StringIdxEntry) != 0) {
         LOG(WARNING) << "Offsets " << offsets_path_ << " file is truncated";
       }
       const uint64_t str_count =
           storage_is_empty ? 0 : getNumStringsFromStorage(bytes / sizeof(StringIdxEntry));
       collisions_ = 0;
       // at this point we know the size of the StringDict we need to load
       // so lets reallocate the vector to the correct size
       const uint64_t max_entries =
           std::max(round_up_p2(str_count * 2 + 1),
                    round_up_p2(std::max(initial_capacity, static_cast<size_t>(1))));
       std::vector<int32_t> new_str_ids(max_entries, INVALID_STR_ID);
       string_id_string_dict_hash_table_.swap(new_str_ids);
       if (materialize_hashes_) {
         std::vector<string_dict_hash_t> new_hash_cache(max_entries / 2);
         hash_cache_.swap(new_hash_cache);
       }
       // Bail early if we know we don't have strings to add (i.e. a new or empty
       // dictionary)
       if (str_count == 0) {
         return;
       }
 
       unsigned string_id = 0;
       std::lock_guard<std::shared_mutex> write_lock(rw_mutex_);
 
       uint32_t thread_inits = 0;
       const auto thread_count = std::thread::hardware_concurrency();
       const uint32_t items_per_thread = std::max<uint32_t>(
           2000, std::min<uint32_t>(200000, (str_count / thread_count) + 1));
       std::vector<std::future<std::vector<std::pair<string_dict_hash_t, unsigned int>>>>
           dictionary_futures;
       for (string_id = 0; string_id < str_count; string_id += items_per_thread) {
         dictionary_futures.emplace_back(std::async(
             std::launch::async, [string_id, str_count, items_per_thread, this] {
               std::vector<std::pair<string_dict_hash_t, unsigned int>> hashVec;
               for (uint32_t curr_id = string_id;
                    curr_id < string_id + items_per_thread && curr_id < str_count;
                    curr_id++) {
                 const auto recovered = getStringFromStorage(curr_id);
                 if (recovered.canary) {
                   // hit the canary, recovery finished
                   break;
                 } else {
                   std::string_view temp(recovered.c_str_ptr, recovered.size);
                   hashVec.emplace_back(std::make_pair(hash_string(temp), temp.size()));
                 }
               }
               return hashVec;
             }));
         thread_inits++;
         if (thread_inits % thread_count == 0) {
           processDictionaryFutures(dictionary_futures);
         }
       }
       // gather last few threads
       if (dictionary_futures.size() != 0) {
         processDictionaryFutures(dictionary_futures);
       }
       VLOG(1) << "Opened string dictionary " << folder << " # Strings: " << str_count_
               << " Hash table size: " << string_id_string_dict_hash_table_.size()
               << " Fill rate: "
               << static_cast<double>(str_count_) * 100.0 /
                      string_id_string_dict_hash_table_.size()
               << "% Collisions: " << collisions_;
     }
   }
 }

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StringDictionary::StringDictionary	(	const LeafHostInfo &	host,
		const DictRef	dict_ref
	)

Definition at line 349 of file StringDictionary.cpp.

     : dict_ref_(dict_ref)
     , folder_("DB_" + std::to_string(dict_ref.dbId) + "_DICT_" +
               std::to_string(dict_ref.dictId))
     , strings_cache_(nullptr)
     , client_(new StringDictionaryClient(host, dict_ref, true))
     , client_no_timeout_(new StringDictionaryClient(host, dict_ref, false)) {}

StringDictionary::~StringDictionary ( )

noexcept

Definition at line 357 of file StringDictionary.cpp.

References CANARY_BUFFER, CHECK, CHECK_GE, heavyai::checked_munmap(), heavyai::close(), isClient(), isTemp_, offset_fd_, offset_file_size_, offset_map_, payload_fd_, payload_file_size_, and payload_map_.

                                              {
   free(CANARY_BUFFER);
   if (isClient()) {
     return;
   }
   if (payload_map_) {
     if (!isTemp_) {
       CHECK(offset_map_);
       heavyai::checked_munmap(payload_map_, payload_file_size_);
       heavyai::checked_munmap(offset_map_, offset_file_size_);
       CHECK_GE(payload_fd_, 0);
       heavyai::close(payload_fd_);
       CHECK_GE(offset_fd_, 0);
       heavyai::close(offset_fd_);
     } else {
       CHECK(offset_map_);
       free(payload_map_);
       free(offset_map_);
     }
   }
 }

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Member Function Documentation

void * StringDictionary::addMemoryCapacity	(	void *	addr,
		size_t &	mem_size,
		const size_t	min_capacity_requested = `0`
	)

privatenoexcept

Definition at line 1543 of file StringDictionary.cpp.

References CHECK, and anonymous_namespace{StringDictionary.cpp}::SYSTEM_PAGE_SIZE.

                                                                                         {
   const size_t canary_buff_size_to_add =
       std::max(static_cast<size_t>(1024 * SYSTEM_PAGE_SIZE),
                (min_capacity_requested / SYSTEM_PAGE_SIZE + 1) * SYSTEM_PAGE_SIZE);
   if (canary_buffer_size < canary_buff_size_to_add) {
     CANARY_BUFFER =
         reinterpret_cast<char*>(realloc(CANARY_BUFFER, canary_buff_size_to_add));
     canary_buffer_size = canary_buff_size_to_add;
     CHECK(CANARY_BUFFER);
     memset(CANARY_BUFFER, 0xff, canary_buff_size_to_add);
   }
   void* new_addr = realloc(addr, mem_size + canary_buff_size_to_add);
   CHECK(new_addr);
   void* write_addr = reinterpret_cast<void*>(static_cast<char*>(new_addr) + mem_size);
   CHECK(memcpy(write_addr, CANARY_BUFFER, canary_buff_size_to_add));
   mem_size += canary_buff_size_to_add;
   return new_addr;
 }

void StringDictionary::addOffsetCapacity ( const size_t min_capacity_requested = 0 )

privatenoexcept

Definition at line 1513 of file StringDictionary.cpp.

Referenced by checkAndConditionallyIncreaseOffsetCapacity(), and StringDictionary().

                                                                                      {
   if (!isTemp_) {
     offset_file_size_ += addStorageCapacity(offset_fd_, min_capacity_requested);
   } else {
     offset_map_ = static_cast<StringIdxEntry*>(
         addMemoryCapacity(offset_map_, offset_file_size_, min_capacity_requested));
   }
 }

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void StringDictionary::addPayloadCapacity ( const size_t min_capacity_requested = 0 )

privatenoexcept

Definition at line 1504 of file StringDictionary.cpp.

Referenced by checkAndConditionallyIncreasePayloadCapacity(), and StringDictionary().

                                                                                       {
   if (!isTemp_) {
     payload_file_size_ += addStorageCapacity(payload_fd_, min_capacity_requested);
   } else {
     payload_map_ = static_cast<char*>(
         addMemoryCapacity(payload_map_, payload_file_size_, min_capacity_requested));
   }
 }

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size_t StringDictionary::addStorageCapacity	(	int	fd,
		const size_t	min_capacity_requested = `0`
	)

privatenoexcept

Definition at line 1522 of file StringDictionary.cpp.

References CHECK, CHECK_NE, anonymous_namespace{StringDictionary.cpp}::SYSTEM_PAGE_SIZE, and File_Namespace::write().

                                                   {
   const size_t canary_buff_size_to_add =
       std::max(static_cast<size_t>(1024 * SYSTEM_PAGE_SIZE),
                (min_capacity_requested / SYSTEM_PAGE_SIZE + 1) * SYSTEM_PAGE_SIZE);
 
   if (canary_buffer_size < canary_buff_size_to_add) {
     CANARY_BUFFER = static_cast<char*>(realloc(CANARY_BUFFER, canary_buff_size_to_add));
     canary_buffer_size = canary_buff_size_to_add;
     CHECK(CANARY_BUFFER);
     memset(CANARY_BUFFER, 0xff, canary_buff_size_to_add);
   }
 
   CHECK_NE(lseek(fd, 0, SEEK_END), -1);
   const auto write_return = write(fd, CANARY_BUFFER, canary_buff_size_to_add);
   CHECK(write_return > 0 &&
         (static_cast<size_t>(write_return) == canary_buff_size_to_add));
   return canary_buff_size_to_add;
 }

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template<class String >

void StringDictionary::appendToStorage ( const String str )

privatenoexcept

Definition at line 1449 of file StringDictionary.cpp.

References StringDictionary::StringIdxEntry::size.

Referenced by getOrAddBulk().

                                                                 {
   // write the payload
   checkAndConditionallyIncreasePayloadCapacity(str.size());
   memcpy(payload_map_ + payload_file_off_, str.data(), str.size());
 
   // write the offset and length
   StringIdxEntry str_meta{static_cast<uint64_t>(payload_file_off_), str.size()};
   payload_file_off_ += str.size();  // Need to increment after we've defined str_meta
 
   checkAndConditionallyIncreaseOffsetCapacity(sizeof(str_meta));
   memcpy(offset_map_ + str_count_, &str_meta, sizeof(str_meta));
 }

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template<class String >

void StringDictionary::appendToStorageBulk	(	const std::vector< String > &	input_strings,
		const std::vector< size_t > &	string_memory_ids,
		const size_t	sum_new_strings_lengths
	)

privatenoexcept

Definition at line 1463 of file StringDictionary.cpp.

Referenced by getOrAddBulkParallel().

                                                    {
   const size_t num_strings = string_memory_ids.size();
 
   checkAndConditionallyIncreasePayloadCapacity(sum_new_strings_lengths);
   checkAndConditionallyIncreaseOffsetCapacity(sizeof(StringIdxEntry) * num_strings);
 
   for (size_t i = 0; i < num_strings; ++i) {
     const size_t string_idx = string_memory_ids[i];
     const String str = input_strings[string_idx];
     const size_t str_size(str.size());
     memcpy(payload_map_ + payload_file_off_, str.data(), str_size);
     StringIdxEntry str_meta{static_cast<uint64_t>(payload_file_off_), str_size};
     payload_file_off_ += str_size;  // Need to increment after we've defined str_meta
     memcpy(offset_map_ + str_count_ + i, &str_meta, sizeof(str_meta));
   }
 }

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compare_cache_value_t* StringDictionary::binary_search_cache ( const std::string & pattern ) const

private

std::vector< int32_t > StringDictionary::buildDictionaryTranslationMap	(	const std::shared_ptr< StringDictionary >	dest_dict,
		StringLookupCallback const &	dest_transient_lookup_callback
	)		const

Definition at line 1775 of file StringDictionary.cpp.

References DEBUG_TIMER, and storageEntryCount().

                                                                       {
   auto timer = DEBUG_TIMER(__func__);
   const size_t num_source_strings = storageEntryCount();
   const size_t num_dest_strings = dest_dict->storageEntryCount();
   std::vector<int32_t> translated_ids(num_source_strings);
 
   buildDictionaryTranslationMap(dest_dict.get(),
                                 translated_ids.data(),
                                 num_source_strings,
                                 num_dest_strings,
                                 true,  // Just assume true for dest_has_transients as this
                                        // function is only used for testing currently
                                 dest_transient_lookup_callback,
                                 {});
   return translated_ids;
 }

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size_t StringDictionary::buildDictionaryTranslationMap	(	const StringDictionary *	dest_dict,
		int32_t *	translated_ids,
		const int64_t	source_generation,
		const int64_t	dest_generation,
		const bool	dest_has_transients,
		StringLookupCallback const &	dest_transient_lookup_callback,
		const std::vector< StringOps_Namespace::StringOpInfo > &	string_op_infos
	)		const

Definition at line 1817 of file StringDictionary.cpp.

References CHECK_GE, CHECK_LE, client_no_timeout_, computeBucket(), DEBUG_TIMER, getDbId(), getDictId(), getStringFromStorageFast(), hash_cache_, anonymous_namespace{StringDictionary.cpp}::hash_string(), INVALID_STR_ID, materialize_hashes_, ThreadInfo::num_elems_per_thread, ThreadInfo::num_threads, order_translation_locks(), threading_serial::parallel_for(), rw_mutex_, str_count_, and string_id_string_dict_hash_table_.

                                                                              {
   auto timer = DEBUG_TIMER(__func__);
   CHECK_GE(source_generation, 0L);
   CHECK_GE(dest_generation, 0L);
   const int64_t num_source_strings = source_generation;
   const int64_t num_dest_strings = dest_generation;
 
   // We can bail early if there are no source strings to translate
   if (num_source_strings == 0L) {
     return 0;
   }
 
   // If here we should should have local dictionaries.
   // Note case of transient source dictionaries that aren't
   // seen as remote (they have no client_no_timeout_) is covered
   // by early bail above on num_source_strings == 0
   if (dest_dict->client_no_timeout_) {
     throw std::runtime_error(
         "Cannot translate between a local source and remote destination dictionary.");
   }
 
   // Sort this/source dict and dest dict on folder_ so we can enforce
   // lock ordering and avoid deadlocks
   std::shared_lock<std::shared_mutex> source_read_lock(rw_mutex_, std::defer_lock);
   std::shared_lock<std::shared_mutex> dest_read_lock(dest_dict->rw_mutex_,
                                                      std::defer_lock);
   order_translation_locks(getDbId(),
                           getDictId(),
                           dest_dict->getDbId(),
                           dest_dict->getDictId(),
                           source_read_lock,
                           dest_read_lock);
 
   // For both source and destination dictionaries we cap the max
   // entries to be translated/translated to at the supplied
   // generation arguments, if valid (i.e. >= 0), otherwise just the
   // size of each dictionary
 
   CHECK_LE(num_source_strings, static_cast<int64_t>(str_count_));
   CHECK_LE(num_dest_strings, static_cast<int64_t>(dest_dict->str_count_));
   const bool dest_dictionary_is_empty = (num_dest_strings == 0);
 
   constexpr int64_t target_strings_per_thread{1000};
   const ThreadInfo thread_info(
       std::thread::hardware_concurrency(), num_source_strings, target_strings_per_thread);
   CHECK_GE(thread_info.num_threads, 1L);
   CHECK_GE(thread_info.num_elems_per_thread, 1L);
 
   // We use a tbb::task_arena to cap the number of threads, has been
   // in other contexts been shown to exhibit better performance when low
   // numbers of threads are needed than just letting tbb figure the number of threads,
   // but should benchmark in this specific context
 
   const StringOps_Namespace::StringOps string_ops(string_op_infos);
   const bool has_string_ops = string_ops.size();
 
   tbb::task_arena limited_arena(thread_info.num_threads);
   std::vector<size_t> num_strings_not_translated_per_thread(thread_info.num_threads, 0UL);
   constexpr bool short_circuit_empty_dictionary_translations{false};
   limited_arena.execute([&] {
     CHECK_LE(tbb::this_task_arena::max_concurrency(), thread_info.num_threads);
     if (short_circuit_empty_dictionary_translations && dest_dictionary_is_empty) {
       tbb::parallel_for(
           tbb::blocked_range<int32_t>(
               0,
               num_source_strings,
               thread_info.num_elems_per_thread /* tbb grain_size */),
           [&](const tbb::blocked_range<int32_t>& r) {
             const int32_t start_idx = r.begin();
             const int32_t end_idx = r.end();
             for (int32_t string_idx = start_idx; string_idx != end_idx; ++string_idx) {
               translated_ids[string_idx] = INVALID_STR_ID;
             }
           },
           tbb::simple_partitioner());
       num_strings_not_translated_per_thread[0] += num_source_strings;
     } else {
       // The below logic, by executing low-level private variable accesses on both
       // dictionaries, is less clean than a previous variant that simply called
       // `getStringViews` from the source dictionary and then called `getBulk` on the
       // destination dictionary, but this version gets significantly better performance
       // (~2X), likely due to eliminating the overhead of writing out the string views and
       // then reading them back in (along with the associated cache misses)
       tbb::parallel_for(
           tbb::blocked_range<int32_t>(
               0,
               num_source_strings,
               thread_info.num_elems_per_thread /* tbb grain_size */),
           [&](const tbb::blocked_range<int32_t>& r) {
             const int32_t start_idx = r.begin();
             const int32_t end_idx = r.end();
             size_t num_strings_not_translated = 0;
             std::string string_ops_storage;  // Needs to be thread local to back
                                              // string_view returned by string_ops()
             for (int32_t source_string_id = start_idx; source_string_id != end_idx;
                  ++source_string_id) {
               const std::string_view source_str =
                   has_string_ops ? string_ops(getStringFromStorageFast(source_string_id),
                                               string_ops_storage)
                                  : getStringFromStorageFast(source_string_id);
 
               if (source_str.empty()) {
                 translated_ids[source_string_id] = inline_int_null_value<int32_t>();
                 continue;
               }
               // Get the hash from this/the source dictionary's cache, as the function
               // will be the same for the dest_dict, sparing us having to recompute it
 
               // Todo(todd): Remove option to turn string hash cache off or at least
               // make a constexpr to avoid these branches when we expect it to be always
               // on going forward
               const string_dict_hash_t hash = (materialize_hashes_ && !has_string_ops)
                                                   ? hash_cache_[source_string_id]
                                                   : hash_string(source_str);
               const uint32_t hash_bucket = dest_dict->computeBucket(
                   hash, source_str, dest_dict->string_id_string_dict_hash_table_);
               const auto translated_string_id =
                   dest_dict->string_id_string_dict_hash_table_[hash_bucket];
               translated_ids[source_string_id] = translated_string_id;
 
               if (translated_string_id == StringDictionary::INVALID_STR_ID ||
                   translated_string_id >= num_dest_strings) {
                 if (dest_has_transients) {
                   num_strings_not_translated +=
                       dest_transient_lookup_callback(source_str, source_string_id);
                 } else {
                   num_strings_not_translated++;
                 }
                 continue;
               }
             }
             const size_t tbb_thread_idx = tbb::this_task_arena::current_thread_index();
             num_strings_not_translated_per_thread[tbb_thread_idx] +=
                 num_strings_not_translated;
           },
           tbb::simple_partitioner());
     }
   });
   size_t total_num_strings_not_translated = 0;
   for (int64_t thread_idx = 0; thread_idx < thread_info.num_threads; ++thread_idx) {
     total_num_strings_not_translated += num_strings_not_translated_per_thread[thread_idx];
   }
   return total_num_strings_not_translated;
 }

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void StringDictionary::buildSortedCache ( )

private

Definition at line 1604 of file StringDictionary.cpp.

References mergeSortedCache(), sortCache(), sorted_cache, and str_count_.

Referenced by getCompare().

                                         {
   // This method is not thread-safe.
   const auto cur_cache_size = sorted_cache.size();
   std::vector<int32_t> temp_sorted_cache;
   for (size_t i = cur_cache_size; i < str_count_; i++) {
     temp_sorted_cache.push_back(i);
   }
   sortCache(temp_sorted_cache);
   mergeSortedCache(temp_sorted_cache);
 }

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void StringDictionary::checkAndConditionallyIncreaseOffsetCapacity ( const size_t write_length )

private

Definition at line 1428 of file StringDictionary.cpp.

References addOffsetCapacity(), CHECK, CHECK_GE, heavyai::checked_mmap(), heavyai::checked_munmap(), isTemp_, offset_fd_, offset_file_size_, offset_map_, and str_count_.

                                {
   const size_t offset_file_off = str_count_ * sizeof(StringIdxEntry);
   if (offset_file_off + write_length >= offset_file_size_) {
     const size_t min_capacity_needed =
         write_length - (offset_file_size_ - offset_file_off);
     if (!isTemp_) {
       CHECK_GE(offset_fd_, 0);
       heavyai::checked_munmap(offset_map_, offset_file_size_);
       addOffsetCapacity(min_capacity_needed);
       CHECK(offset_file_off + write_length <= offset_file_size_);
       offset_map_ = reinterpret_cast<StringIdxEntry*>(
           heavyai::checked_mmap(offset_fd_, offset_file_size_));
     } else {
       addOffsetCapacity(min_capacity_needed);
       CHECK(offset_file_off + write_length <= offset_file_size_);
     }
   }
 }

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void StringDictionary::checkAndConditionallyIncreasePayloadCapacity ( const size_t write_length )

private

Definition at line 1409 of file StringDictionary.cpp.

References addPayloadCapacity(), CHECK, CHECK_GE, heavyai::checked_mmap(), heavyai::checked_munmap(), isTemp_, payload_fd_, payload_file_off_, payload_file_size_, and payload_map_.

                                {
   if (payload_file_off_ + write_length > payload_file_size_) {
     const size_t min_capacity_needed =
         write_length - (payload_file_size_ - payload_file_off_);
     if (!isTemp_) {
       CHECK_GE(payload_fd_, 0);
       heavyai::checked_munmap(payload_map_, payload_file_size_);
       addPayloadCapacity(min_capacity_needed);
       CHECK(payload_file_off_ + write_length <= payload_file_size_);
       payload_map_ =
           reinterpret_cast<char*>(heavyai::checked_mmap(payload_fd_, payload_file_size_));
     } else {
       addPayloadCapacity(min_capacity_needed);
       CHECK(payload_file_off_ + write_length <= payload_file_size_);
     }
   }
 }

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bool StringDictionary::checkpoint ( )

noexcept

Definition at line 1581 of file StringDictionary.cpp.

References CHECK, client_, heavyai::fsync(), isClient(), isTemp_, heavyai::msync(), offset_fd_, offset_file_size_, offset_map_, payload_fd_, payload_file_size_, and payload_map_.

Referenced by import_export::TypedImportBuffer::stringDictCheckpoint().

                                            {
   if (isClient()) {
     try {
       return client_->checkpoint();
     } catch (...) {
       return false;
     }
   }
   CHECK(!isTemp_);
   bool ret = true;
   ret = ret &&
         (heavyai::msync((void*)offset_map_, offset_file_size_, /*async=*/false) == 0);
   ret = ret &&
         (heavyai::msync((void*)payload_map_, payload_file_size_, /*async=*/false) == 0);
   ret = ret && (heavyai::fsync(offset_fd_) == 0);
   ret = ret && (heavyai::fsync(payload_fd_) == 0);
   return ret;
 }

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template<class String >

uint32_t StringDictionary::computeBucket	(	const string_dict_hash_t	hash,
		const String &	input_string,
		const std::vector< int32_t > &	string_id_string_dict_hash_table
	)		const

privatenoexcept

Definition at line 1311 of file StringDictionary.cpp.

Referenced by buildDictionaryTranslationMap(), getBulk(), and getOrAddBulk().

                                                                                {
   const size_t string_dict_hash_table_size = string_id_string_dict_hash_table.size();
   uint32_t bucket = hash & (string_dict_hash_table_size - 1);
   while (true) {
     const int32_t candidate_string_id = string_id_string_dict_hash_table[bucket];
     if (candidate_string_id ==
         INVALID_STR_ID) {  // In this case it means the slot is available for use
       break;
     }
     if ((materialize_hashes_ && hash == hash_cache_[candidate_string_id]) ||
         !materialize_hashes_) {
       const auto candidate_string = getStringFromStorageFast(candidate_string_id);
       if (input_string.size() == candidate_string.size() &&
           !memcmp(input_string.data(), candidate_string.data(), input_string.size())) {
         // found the string
         break;
       }
     }
     // wrap around
     if (++bucket == string_dict_hash_table_size) {
       bucket = 0;
     }
   }
   return bucket;
 }

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template<class String >

uint32_t StringDictionary::computeBucketFromStorageAndMemory	(	const string_dict_hash_t	input_string_hash,
		const String &	input_string,
		const std::vector< int32_t > &	string_id_string_dict_hash_table,
		const size_t	storage_high_water_mark,
		const std::vector< String > &	input_strings,
		const std::vector< size_t > &	string_memory_ids
	)		const

privatenoexcept

memcmp(input_string.data(), candidate_storage_string.c_str_ptr, input_string.size())) {

Definition at line 1341 of file StringDictionary.cpp.

Referenced by getOrAddBulkParallel().

                                                                {
   uint32_t bucket = input_string_hash & (string_id_string_dict_hash_table.size() - 1);
   while (true) {
     const int32_t candidate_string_id = string_id_string_dict_hash_table[bucket];
     if (candidate_string_id ==
         INVALID_STR_ID) {  // In this case it means the slot is available for use
       break;
     }
     if (!materialize_hashes_ || (input_string_hash == hash_cache_[candidate_string_id])) {
       if (candidate_string_id > 0 &&
           static_cast<size_t>(candidate_string_id) >= storage_high_water_mark) {
         // The candidate string is not in storage yet but in our string_memory_ids temp
         // buffer
         size_t memory_offset =
             static_cast<size_t>(candidate_string_id - storage_high_water_mark);
         const String candidate_string = input_strings[string_memory_ids[memory_offset]];
         if (input_string.size() == candidate_string.size() &&
             !memcmp(input_string.data(), candidate_string.data(), input_string.size())) {
           // found the string in the temp memory buffer
           break;
         }
       } else {
         // The candidate string is in storage, need to fetch it for comparison
         const auto candidate_storage_string =
             getStringFromStorageFast(candidate_string_id);
         if (input_string.size() == candidate_storage_string.size() &&
             !memcmp(input_string.data(),
                     candidate_storage_string.data(),
                     input_string.size())) {
           // found the string in storage
           break;
         }
       }
     }
     if (++bucket == string_id_string_dict_hash_table.size()) {
       bucket = 0;
     }
   }
   return bucket;
 }

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uint32_t StringDictionary::computeUniqueBucketWithHash	(	const string_dict_hash_t	hash,
		const std::vector< int32_t > &	string_id_string_dict_hash_table
	)

privatenoexcept

Definition at line 1390 of file StringDictionary.cpp.

Referenced by increaseHashTableCapacity(), and processDictionaryFutures().

                                                                          {
   const size_t string_dict_hash_table_size = string_id_string_dict_hash_table.size();
   uint32_t bucket = hash & (string_dict_hash_table_size - 1);
   while (true) {
     if (string_id_string_dict_hash_table[bucket] ==
         INVALID_STR_ID) {  // In this case it means the slot is available for use
       break;
     }
     collisions_++;
     // wrap around
     if (++bucket == string_dict_hash_table_size) {
       bucket = 0;
     }
   }
   return bucket;
 }

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std::vector< std::string > StringDictionary::copyStrings ( ) const

Definition at line 1146 of file StringDictionary.cpp.

References threading_serial::async(), CHECK_EQ, CHECK_GT, CHECK_LE, gpu_enabled::copy(), cpu_threads(), getStringUnlocked(), isClient(), rw_mutex_, str_count_, and strings_cache_.

                                                          {
   std::lock_guard<std::shared_mutex> write_lock(rw_mutex_);
   if (isClient()) {
     // TODO(miyu): support remote string dictionary
     throw std::runtime_error(
         "copying dictionaries from remote server is not supported yet.");
   }
 
   if (strings_cache_) {
     return *strings_cache_;
   }
 
   strings_cache_ = std::make_shared<std::vector<std::string>>();
   strings_cache_->reserve(str_count_);
   const bool multithreaded = str_count_ > 10000;
   const auto worker_count =
       multithreaded ? static_cast<size_t>(cpu_threads()) : size_t(1);
   CHECK_GT(worker_count, 0UL);
   std::vector<std::vector<std::string>> worker_results(worker_count);
   auto copy = [this](std::vector<std::string>& str_list,
                      const size_t start_id,
                      const size_t end_id) {
     CHECK_LE(start_id, end_id);
     str_list.reserve(end_id - start_id);
     for (size_t string_id = start_id; string_id < end_id; ++string_id) {
       str_list.push_back(getStringUnlocked(string_id));
     }
   };
   if (multithreaded) {
     std::vector<std::future<void>> workers;
     const auto stride = (str_count_ + (worker_count - 1)) / worker_count;
     for (size_t worker_idx = 0, start = 0, end = std::min(start + stride, str_count_);
          worker_idx < worker_count && start < str_count_;
          ++worker_idx, start += stride, end = std::min(start + stride, str_count_)) {
       workers.push_back(std::async(
           std::launch::async, copy, std::ref(worker_results[worker_idx]), start, end));
     }
     for (auto& worker : workers) {
       worker.get();
     }
   } else {
     CHECK_EQ(worker_results.size(), size_t(1));
     copy(worker_results[0], 0, str_count_);
   }
 
   for (const auto& worker_result : worker_results) {
     strings_cache_->insert(
         strings_cache_->end(), worker_result.begin(), worker_result.end());
   }
   return *strings_cache_;
 }

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void StringDictionary::eachStringSerially	(	int64_t const	generation,
		StringCallback &	serial_callback
	)		const

Definition at line 267 of file StringDictionary.cpp.

References CHECK_LE, client_, getStringFromStorageFast(), isClient(), anonymous_namespace{Utm.h}::n, rw_mutex_, storageEntryCount(), and str_count_.

Referenced by makeLambdaStringToId().

                                                                                  {
   if (isClient()) {
     // copyStrings() is not supported when isClient().
     std::string str;  // Import buffer. Placing outside of loop should reduce allocations.
     size_t const n = std::min(static_cast<size_t>(generation), storageEntryCount());
     CHECK_LE(n, static_cast<size_t>(std::numeric_limits<int32_t>::max()) + 1);
     for (unsigned id = 0; id < n; ++id) {
       {
         std::shared_lock<std::shared_mutex> read_lock(rw_mutex_);
         client_->get_string(str, id);
       }
       serial_callback(str, id);
     }
   } else {
     size_t const n = std::min(static_cast<size_t>(generation), str_count_);
     CHECK_LE(n, static_cast<size_t>(std::numeric_limits<int32_t>::max()) + 1);
     std::shared_lock<std::shared_mutex> read_lock(rw_mutex_);
     for (unsigned id = 0; id < n; ++id) {
       serial_callback(getStringFromStorageFast(static_cast<int>(id)), id);
     }
   }
 }

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bool StringDictionary::fillRateIsHigh ( const size_t num_strings ) const

privatenoexcept

Definition at line 1198 of file StringDictionary.cpp.

Referenced by getOrAddBulk(), and getOrAddBulkParallel().

                                                                              {
   return string_id_string_dict_hash_table_.size() <= num_strings * 2;
 }

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template<class T , class String >

size_t StringDictionary::getBulk	(	const std::vector< String > &	string_vec,
		T *	encoded_vec
	)		const

Definition at line 488 of file StringDictionary.cpp.

                                                        {
   return getBulk(string_vec, encoded_vec, -1L /* generation */);
 }

template<class T , class String >

size_t StringDictionary::getBulk	(	const std::vector< String > &	string_vec,
		T *	encoded_vec,
		const int64_t	generation
	)		const

Definition at line 501 of file StringDictionary.cpp.

References CHECK_GE, CHECK_LE, computeBucket(), dict_ref_, anonymous_namespace{StringDictionary.cpp}::hash_string(), INVALID_STR_ID, MAX_STRLEN, ThreadInfo::num_elems_per_thread, ThreadInfo::num_threads, threading_serial::parallel_for(), rw_mutex_, storageEntryCount(), string_id_string_dict_hash_table_, and anonymous_namespace{StringDictionary.cpp}::throw_string_too_long_error().

                                                                  {
   constexpr int64_t target_strings_per_thread{1000};
   const int64_t num_lookup_strings = string_vec.size();
   if (num_lookup_strings == 0) {
     return 0;
   }
 
   const ThreadInfo thread_info(
       std::thread::hardware_concurrency(), num_lookup_strings, target_strings_per_thread);
   CHECK_GE(thread_info.num_threads, 1L);
   CHECK_GE(thread_info.num_elems_per_thread, 1L);
 
   std::vector<size_t> num_strings_not_found_per_thread(thread_info.num_threads, 0UL);
 
   std::shared_lock<std::shared_mutex> read_lock(rw_mutex_);
   const int64_t num_dict_strings = generation >= 0 ? generation : storageEntryCount();
   const bool dictionary_is_empty = (num_dict_strings == 0);
   if (dictionary_is_empty) {
     tbb::parallel_for(tbb::blocked_range<int64_t>(0, num_lookup_strings),
                       [&](const tbb::blocked_range<int64_t>& r) {
                         const int64_t start_idx = r.begin();
                         const int64_t end_idx = r.end();
                         for (int64_t string_idx = start_idx; string_idx < end_idx;
                              ++string_idx) {
                           encoded_vec[string_idx] = StringDictionary::INVALID_STR_ID;
                         }
                       });
     return num_lookup_strings;
   }
   // If we're here the generation-capped dictionary has strings in it
   // that we need to look up against
 
   tbb::task_arena limited_arena(thread_info.num_threads);
   limited_arena.execute([&] {
     CHECK_LE(tbb::this_task_arena::max_concurrency(), thread_info.num_threads);
     tbb::parallel_for(
         tbb::blocked_range<int64_t>(
             0, num_lookup_strings, thread_info.num_elems_per_thread /* tbb grain_size */),
         [&](const tbb::blocked_range<int64_t>& r) {
           const int64_t start_idx = r.begin();
           const int64_t end_idx = r.end();
           size_t num_strings_not_found = 0;
           for (int64_t string_idx = start_idx; string_idx != end_idx; ++string_idx) {
             const auto& input_string = string_vec[string_idx];
             if (input_string.empty()) {
               encoded_vec[string_idx] = inline_int_null_value<T>();
               continue;
             }
             if (input_string.size() > StringDictionary::MAX_STRLEN) {
               throw_string_too_long_error(input_string, dict_ref_);
             }
             const string_dict_hash_t input_string_hash = hash_string(input_string);
             uint32_t hash_bucket = computeBucket(
                 input_string_hash, input_string, string_id_string_dict_hash_table_);
             // Will either be legit id or INVALID_STR_ID
             const auto string_id = string_id_string_dict_hash_table_[hash_bucket];
             if (string_id == StringDictionary::INVALID_STR_ID ||
                 string_id >= num_dict_strings) {
               encoded_vec[string_idx] = StringDictionary::INVALID_STR_ID;
               num_strings_not_found++;
               continue;
             }
             encoded_vec[string_idx] = string_id;
           }
           const size_t tbb_thread_idx = tbb::this_task_arena::current_thread_index();
           num_strings_not_found_per_thread[tbb_thread_idx] = num_strings_not_found;
         },
         tbb::simple_partitioner());
   });
 
   size_t num_strings_not_found = 0;
   for (int64_t thread_idx = 0; thread_idx < thread_info.num_threads; ++thread_idx) {
     num_strings_not_found += num_strings_not_found_per_thread[thread_idx];
   }
   return num_strings_not_found;
 }

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std::vector< int32_t > StringDictionary::getCompare	(	const std::string &	pattern,
		const std::string &	comp_operator,
		const size_t	generation
	)

Definition at line 938 of file StringDictionary.cpp.

References anonymous_namespace{Utm.h}::a, buildSortedCache(), client_, compare_cache_, getEquals(), getStringFromStorage(), isClient(), gpu_enabled::lower_bound(), rw_mutex_, sorted_cache, str_count_, string_eq(), and string_lt().

                                                                            {
   std::lock_guard<std::shared_mutex> write_lock(rw_mutex_);
   if (isClient()) {
     return client_->get_compare(pattern, comp_operator, generation);
   }
   std::vector<int32_t> ret;
   if (str_count_ == 0) {
     return ret;
   }
   if (sorted_cache.size() < str_count_) {
     if (comp_operator == "=" || comp_operator == "<>") {
       return getEquals(pattern, comp_operator, generation);
     }
 
     buildSortedCache();
   }
   auto cache_index = compare_cache_.get(pattern);
 
   if (!cache_index) {
     cache_index = std::make_shared<StringDictionary::compare_cache_value_t>();
     const auto cache_itr = std::lower_bound(
         sorted_cache.begin(),
         sorted_cache.end(),
         pattern,
         [this](decltype(sorted_cache)::value_type const& a, decltype(pattern)& b) {
           auto a_str = this->getStringFromStorage(a);
           return string_lt(a_str.c_str_ptr, a_str.size, b.c_str(), b.size());
         });
 
     if (cache_itr == sorted_cache.end()) {
       cache_index->index = sorted_cache.size() - 1;
       cache_index->diff = 1;
     } else {
       const auto cache_str = getStringFromStorage(*cache_itr);
       if (!string_eq(
               cache_str.c_str_ptr, cache_str.size, pattern.c_str(), pattern.size())) {
         cache_index->index = cache_itr - sorted_cache.begin() - 1;
         cache_index->diff = 1;
       } else {
         cache_index->index = cache_itr - sorted_cache.begin();
         cache_index->diff = 0;
       }
     }
 
     compare_cache_.put(pattern, cache_index);
   }
 
   // since we have a cache in form of vector of ints which is sorted according to
   // corresponding strings in the dictionary all we need is the index of the element
   // which equal to the pattern that we are trying to match or the index of “biggest”
   // element smaller than the pattern, to perform all the comparison operators over
   // string. The search function guarantees we have such index so now it is just the
   // matter to include all the elements in the result vector.
 
   // For < operator if the index that we have points to the element which is equal to
   // the pattern that we are searching for we simply get all the elements less than the
   // index. If the element pointed by the index is not equal to the pattern we are
   // comparing with we also need to include that index in result vector, except when the
   // index points to 0 and the pattern is lesser than the smallest value in the string
   // dictionary.
 
   if (comp_operator == "<") {
     size_t idx = cache_index->index;
     if (cache_index->diff) {
       idx = cache_index->index + 1;
       if (cache_index->index == 0 && cache_index->diff > 0) {
         idx = cache_index->index;
       }
     }
     for (size_t i = 0; i < idx; i++) {
       ret.push_back(sorted_cache[i]);
     }
 
     // For <= operator if the index that we have points to the element which is equal to
     // the pattern that we are searching for we want to include the element pointed by
     // the index in the result set. If the element pointed by the index is not equal to
     // the pattern we are comparing with we just want to include all the ids with index
     // less than the index that is cached, except when pattern that we are searching for
     // is smaller than the smallest string in the dictionary.
 
   } else if (comp_operator == "<=") {
     size_t idx = cache_index->index + 1;
     if (cache_index == 0 && cache_index->diff > 0) {
       idx = cache_index->index;
     }
     for (size_t i = 0; i < idx; i++) {
       ret.push_back(sorted_cache[i]);
     }
 
     // For > operator we want to get all the elements with index greater than the index
     // that we have except, when the pattern we are searching for is lesser than the
     // smallest string in the dictionary we also want to include the id of the index
     // that we have.
 
   } else if (comp_operator == ">") {
     size_t idx = cache_index->index + 1;
     if (cache_index->index == 0 && cache_index->diff > 0) {
       idx = cache_index->index;
     }
     for (size_t i = idx; i < sorted_cache.size(); i++) {
       ret.push_back(sorted_cache[i]);
     }
 
     // For >= operator when the indexed element that we have points to element which is
     // equal to the pattern we are searching for we want to include that in the result
     // vector. If the index that we have does not point to the string which is equal to
     // the pattern we are searching we don’t want to include that id into the result
     // vector except when the index is 0.
 
   } else if (comp_operator == ">=") {
     size_t idx = cache_index->index;
     if (cache_index->diff) {
       idx = cache_index->index + 1;
       if (cache_index->index == 0 && cache_index->diff > 0) {
         idx = cache_index->index;
       }
     }
     for (size_t i = idx; i < sorted_cache.size(); i++) {
       ret.push_back(sorted_cache[i]);
     }
   } else if (comp_operator == "=") {
     if (!cache_index->diff) {
       ret.push_back(sorted_cache[cache_index->index]);
     }
 
     // For <> operator it is simple matter of not including id of string which is equal
     // to pattern we are searching for.
   } else if (comp_operator == "<>") {
     if (!cache_index->diff) {
       size_t idx = cache_index->index;
       for (size_t i = 0; i < idx; i++) {
         ret.push_back(sorted_cache[i]);
       }
       ++idx;
       for (size_t i = idx; i < sorted_cache.size(); i++) {
         ret.push_back(sorted_cache[i]);
       }
     } else {
       for (size_t i = 0; i < sorted_cache.size(); i++) {
         ret.insert(ret.begin(), sorted_cache.begin(), sorted_cache.end());
       }
     }
 
   } else {
     std::runtime_error("Unsupported string comparison operator");
   }
   return ret;
 }

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int32_t StringDictionary::getDbId ( ) const

noexcept

Definition at line 311 of file StringDictionary.cpp.

References dict_ref_t::dbId, and dict_ref_.

Referenced by buildDictionaryTranslationMap().

                                                  {
   return dict_ref_.dbId;
 }

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int32_t StringDictionary::getDictId ( ) const

noexcept

Definition at line 315 of file StringDictionary.cpp.

References dict_ref_, and dict_ref_t::dictId.

Referenced by RowSetMemoryOwner::addStringProxyIntersectionTranslationMap(), RowSetMemoryOwner::addStringProxyUnionTranslationMap(), and buildDictionaryTranslationMap().

                                                    {
   return dict_ref_.dictId;
 }

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std::vector< int32_t > StringDictionary::getEquals	(	std::string	pattern,
		std::string	comp_operator,
		size_t	generation
	)

private

Definition at line 878 of file StringDictionary.cpp.

References CHECK, CHECK_GT, CHECK_LE, cpu_threads(), equal_cache_, getStringUnlocked(), MAX_STRLEN, run_benchmark_import::result, and str_count_.

Referenced by getCompare().

                                                                     {
   std::vector<int32_t> result;
   auto eq_id_itr = equal_cache_.find(pattern);
   int32_t eq_id = MAX_STRLEN + 1;
   int32_t cur_size = str_count_;
   if (eq_id_itr != equal_cache_.end()) {
     auto eq_id = eq_id_itr->second;
     if (comp_operator == "=") {
       result.push_back(eq_id);
     } else {
       for (int32_t idx = 0; idx <= cur_size; idx++) {
         if (idx == eq_id) {
           continue;
         }
         result.push_back(idx);
       }
     }
   } else {
     std::vector<std::thread> workers;
     int worker_count = cpu_threads();
     CHECK_GT(worker_count, 0);
     std::vector<std::vector<int32_t>> worker_results(worker_count);
     CHECK_LE(generation, str_count_);
     for (int worker_idx = 0; worker_idx < worker_count; ++worker_idx) {
       workers.emplace_back(
           [&worker_results, &pattern, generation, worker_idx, worker_count, this]() {
             for (size_t string_id = worker_idx; string_id < generation;
                  string_id += worker_count) {
               const auto str = getStringUnlocked(string_id);
               if (str == pattern) {
                 worker_results[worker_idx].push_back(string_id);
               }
             }
           });
     }
     for (auto& worker : workers) {
       worker.join();
     }
     for (const auto& worker_result : worker_results) {
       result.insert(result.end(), worker_result.begin(), worker_result.end());
     }
     if (result.size() > 0) {
       const auto it_ok = equal_cache_.insert(std::make_pair(pattern, result[0]));
       CHECK(it_ok.second);
       eq_id = result[0];
     }
     if (comp_operator == "<>") {
       for (int32_t idx = 0; idx <= cur_size; idx++) {
         if (idx == eq_id) {
           continue;
         }
         result.push_back(idx);
       }
     }
   }
   return result;
 }

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template<class String >

template int32_t StringDictionary::getIdOfString ( const String & ) const

Definition at line 745 of file StringDictionary.cpp.

References client_, getUnlocked(), isClient(), and rw_mutex_.

                                                                {
   std::shared_lock<std::shared_mutex> read_lock(rw_mutex_);
   if (isClient()) {
     if constexpr (std::is_same_v<std::string, std::decay_t<String>>) {
       return client_->get(str);
     } else {
       return client_->get(std::string(str));
     }
   }
   return getUnlocked(str);
 }

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std::vector< int32_t > StringDictionary::getLike	(	const std::string &	pattern,
		const bool	icase,
		const bool	is_simple,
		const char	escape,
		const size_t	generation
	)		const

Definition at line 825 of file StringDictionary.cpp.

References CHECK, CHECK_GT, CHECK_LE, client_, cpu_threads(), getStringUnlocked(), anonymous_namespace{StringDictionary.cpp}::is_like(), isClient(), like_cache_, run_benchmark_import::result, rw_mutex_, and str_count_.

                                                                               {
   std::lock_guard<std::shared_mutex> write_lock(rw_mutex_);
   if (isClient()) {
     return client_->get_like(pattern, icase, is_simple, escape, generation);
   }
   const auto cache_key = std::make_tuple(pattern, icase, is_simple, escape);
   const auto it = like_cache_.find(cache_key);
   if (it != like_cache_.end()) {
     return it->second;
   }
   std::vector<int32_t> result;
   std::vector<std::thread> workers;
   int worker_count = cpu_threads();
   CHECK_GT(worker_count, 0);
   std::vector<std::vector<int32_t>> worker_results(worker_count);
   CHECK_LE(generation, str_count_);
   for (int worker_idx = 0; worker_idx < worker_count; ++worker_idx) {
     workers.emplace_back([&worker_results,
                           &pattern,
                           generation,
                           icase,
                           is_simple,
                           escape,
                           worker_idx,
                           worker_count,
                           this]() {
       for (size_t string_id = worker_idx; string_id < generation;
            string_id += worker_count) {
         const auto str = getStringUnlocked(string_id);
         if (is_like(str, pattern, icase, is_simple, escape)) {
           worker_results[worker_idx].push_back(string_id);
         }
       }
     });
   }
   for (auto& worker : workers) {
     worker.join();
   }
   for (const auto& worker_result : worker_results) {
     result.insert(result.end(), worker_result.begin(), worker_result.end());
   }
   // place result into cache for reuse if similar query
   const auto it_ok = like_cache_.insert(std::make_pair(cache_key, result));
 
   CHECK(it_ok.second);
 
   return result;
 }

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size_t StringDictionary::getNumStringsFromStorage ( const size_t storage_slots ) const

privatenoexcept

Method to retrieve number of strings in storage via a binary search for the first canary

Parameters

storage_slots number of storage entries we should search to find the minimum canary

Returns: number of strings in storage

Definition at line 326 of file StringDictionary.cpp.

References CHECK_GE.

Referenced by StringDictionary().

              {
   if (storage_slots == 0) {
     return 0;
   }
   // Must use signed integers since final binary search step can wrap to max size_t value
   // if dictionary is empty
   int64_t min_bound = 0;
   int64_t max_bound = storage_slots - 1;
   int64_t guess{0};
   while (min_bound <= max_bound) {
     guess = (max_bound + min_bound) / 2;
     CHECK_GE(guess, 0);
     if (getStringFromStorage(guess).canary) {
       max_bound = guess - 1;
     } else {
       min_bound = guess + 1;
     }
   }
   CHECK_GE(guess + (min_bound > guess ? 1 : 0), 0);
   return guess + (min_bound > guess ? 1 : 0);
 }

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int32_t StringDictionary::getOrAdd ( const std::string & str )

noexcept

Definition at line 382 of file StringDictionary.cpp.

References CHECK_EQ.

                                                                 {
   if (isClient()) {
     std::vector<int32_t> string_ids;
     client_->get_or_add_bulk(string_ids, std::vector<std::string>{str});
     CHECK_EQ(size_t(1), string_ids.size());
     return string_ids.front();
   }
   return getOrAddImpl(str);
 }

template<class T , class String >

template void StringDictionary::getOrAddBulk	(	const std::vector< String > &	string_vec,
		T *	encoded_vec
	)

Definition at line 591 of file StringDictionary.cpp.

References appendToStorage(), CHECK, CHECK_LT, computeBucket(), dict_ref_, fillRateIsHigh(), g_enable_stringdict_parallel, getOrAddBulkParallel(), hash_cache_, anonymous_namespace{StringDictionary.cpp}::hash_string(), increaseHashTableCapacity(), INVALID_STR_ID, invalidateInvertedIndex(), materialize_hashes_, MAX_STRCOUNT, MAX_STRLEN, offsets_path_, rw_mutex_, str_count_, and string_id_string_dict_hash_table_.

Referenced by import_export::TypedImportBuffer::addDictEncodedString(), ArrowForeignStorageBase::convertArrowDictionary(), ArrowForeignStorageBase::createDictionaryEncodedColumn(), foreign_storage::ParquetStringEncoder< V >::encodeAndCopyContiguous(), getOrAddBulkArray(), and populate_string_ids().

                                                           {
   if (g_enable_stringdict_parallel) {
     getOrAddBulkParallel(input_strings, output_string_ids);
     return;
   }
   // Single-thread path.
   std::lock_guard<std::shared_mutex> write_lock(rw_mutex_);
 
   const size_t initial_str_count = str_count_;
   size_t idx = 0;
   for (const auto& input_string : input_strings) {
     if (input_string.empty()) {
       output_string_ids[idx++] = inline_int_null_value<T>();
       continue;
     }
     CHECK(input_string.size() <= MAX_STRLEN);
 
     const string_dict_hash_t input_string_hash = hash_string(input_string);
     uint32_t hash_bucket =
         computeBucket(input_string_hash, input_string, string_id_string_dict_hash_table_);
     if (string_id_string_dict_hash_table_[hash_bucket] != INVALID_STR_ID) {
       output_string_ids[idx++] = string_id_string_dict_hash_table_[hash_bucket];
       continue;
     }
     // need to add record to dictionary
     // check there is room
     if (str_count_ > static_cast<size_t>(max_valid_int_value<T>())) {
       throw_encoding_error<T>(input_string, dict_ref_);
     }
     CHECK_LT(str_count_, MAX_STRCOUNT)
         << "Maximum number (" << str_count_
         << ") of Dictionary encoded Strings reached for this column, offset path "
            "for column is  "
         << offsets_path_;
     if (fillRateIsHigh(str_count_)) {
       // resize when more than 50% is full
       increaseHashTableCapacity();
       hash_bucket = computeBucket(
           input_string_hash, input_string, string_id_string_dict_hash_table_);
     }
     appendToStorage(input_string);
 
     if (materialize_hashes_) {
       hash_cache_[str_count_] = input_string_hash;
     }
     const int32_t string_id = static_cast<int32_t>(str_count_);
     string_id_string_dict_hash_table_[hash_bucket] = string_id;
     output_string_ids[idx++] = string_id;
     ++str_count_;
   }
   const size_t num_strings_added = str_count_ - initial_str_count;
   if (num_strings_added > 0) {
     invalidateInvertedIndex();
   }
 }

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template<class String >

template void StringDictionary::getOrAddBulkArray	(	const std::vector< std::vector< String >> &	string_array_vec,
		std::vector< std::vector< int32_t >> &	ids_array_vec
	)

Definition at line 440 of file StringDictionary.cpp.

References client_no_timeout_, and getOrAddBulk().

Referenced by import_export::TypedImportBuffer::addDictEncodedStringArray().

                                                   {
   if (client_no_timeout_) {
     client_no_timeout_->get_or_add_bulk_array(ids_array_vec, string_array_vec);
     return;
   }
 
   ids_array_vec.resize(string_array_vec.size());
   for (size_t i = 0; i < string_array_vec.size(); i++) {
     auto& strings = string_array_vec[i];
     auto& ids = ids_array_vec[i];
     ids.resize(strings.size());
     getOrAddBulk(strings, &ids[0]);
   }
 }

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template<class T , class String >

void StringDictionary::getOrAddBulkParallel	(	const std::vector< String > &	string_vec,
		T *	encoded_vec
	)

Definition at line 649 of file StringDictionary.cpp.

References appendToStorageBulk(), CHECK, CHECK_LT, computeBucketFromStorageAndMemory(), dict_ref_, fillRateIsHigh(), hash_cache_, hashStrings(), increaseHashTableCapacityFromStorageAndMemory(), INVALID_STR_ID, invalidateInvertedIndex(), materialize_hashes_, MAX_STRCOUNT, MAX_STRLEN, offsets_path_, rw_mutex_, str_count_, and string_id_string_dict_hash_table_.

Referenced by getOrAddBulk().

                                                                   {
   // Compute hashes of the input strings up front, and in parallel,
   // as the string hashing does not need to be behind the subsequent write_lock
   std::vector<string_dict_hash_t> input_strings_hashes(input_strings.size());
   hashStrings(input_strings, input_strings_hashes);
 
   std::lock_guard<std::shared_mutex> write_lock(rw_mutex_);
   size_t shadow_str_count =
       str_count_;  // Need to shadow str_count_ now with bulk add methods
   const size_t storage_high_water_mark = shadow_str_count;
   std::vector<size_t> string_memory_ids;
   size_t sum_new_string_lengths = 0;
   string_memory_ids.reserve(input_strings.size());
   size_t input_string_idx{0};
   for (const auto& input_string : input_strings) {
     // Currently we make empty strings null
     if (input_string.empty()) {
       output_string_ids[input_string_idx++] = inline_int_null_value<T>();
       continue;
     }
     // TODO: Recover gracefully if an input string is too long
     CHECK(input_string.size() <= MAX_STRLEN);
 
     if (fillRateIsHigh(shadow_str_count)) {
       // resize when more than 50% is full
       increaseHashTableCapacityFromStorageAndMemory(shadow_str_count,
                                                     storage_high_water_mark,
                                                     input_strings,
                                                     string_memory_ids,
                                                     input_strings_hashes);
     }
     // Compute the hash for this input_string
     const string_dict_hash_t input_string_hash = input_strings_hashes[input_string_idx];
 
     const uint32_t hash_bucket =
         computeBucketFromStorageAndMemory(input_string_hash,
                                           input_string,
                                           string_id_string_dict_hash_table_,
                                           storage_high_water_mark,
                                           input_strings,
                                           string_memory_ids);
 
     // If the hash bucket is not empty, that is our string id
     // (computeBucketFromStorageAndMemory) already checked to ensure the input string and
     // bucket string are equal)
     if (string_id_string_dict_hash_table_[hash_bucket] != INVALID_STR_ID) {
       output_string_ids[input_string_idx++] =
           string_id_string_dict_hash_table_[hash_bucket];
       continue;
     }
     // Did not find string, so need to add record to dictionary
     // First check there is room
     if (shadow_str_count > static_cast<size_t>(max_valid_int_value<T>())) {
       throw_encoding_error<T>(input_string, dict_ref_);
     }
     CHECK_LT(shadow_str_count, MAX_STRCOUNT)
         << "Maximum number (" << shadow_str_count
         << ") of Dictionary encoded Strings reached for this column, offset path "
            "for column is  "
         << offsets_path_;
 
     string_memory_ids.push_back(input_string_idx);
     sum_new_string_lengths += input_string.size();
     string_id_string_dict_hash_table_[hash_bucket] =
         static_cast<int32_t>(shadow_str_count);
     if (materialize_hashes_) {
       hash_cache_[shadow_str_count] = input_string_hash;
     }
     output_string_ids[input_string_idx++] = shadow_str_count++;
   }
   appendToStorageBulk(input_strings, string_memory_ids, sum_new_string_lengths);
   const size_t num_strings_added = shadow_str_count - str_count_;
   str_count_ = shadow_str_count;
   if (num_strings_added > 0) {
     invalidateInvertedIndex();
   }
 }

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int32_t StringDictionary::getOrAddImpl ( const std::string_view & str )

privatenoexcept

Definition at line 1258 of file StringDictionary.cpp.

References CHECK, CHECK_LT, and anonymous_namespace{StringDictionary.cpp}::hash_string().

                                                                          {
   // @TODO(wei) treat empty string as NULL for now
   if (str.size() == 0) {
     return inline_int_null_value<int32_t>();
   }
   CHECK(str.size() <= MAX_STRLEN);
   const string_dict_hash_t hash = hash_string(str);
   {
     std::shared_lock<std::shared_mutex> read_lock(rw_mutex_);
     const uint32_t bucket = computeBucket(hash, str, string_id_string_dict_hash_table_);
     if (string_id_string_dict_hash_table_[bucket] != INVALID_STR_ID) {
       return string_id_string_dict_hash_table_[bucket];
     }
   }
   std::lock_guard<std::shared_mutex> write_lock(rw_mutex_);
   if (fillRateIsHigh(str_count_)) {
     // resize when more than 50% is full
     increaseHashTableCapacity();
   }
   // need to recalculate the bucket in case it changed before
   // we got the lock
   const uint32_t bucket = computeBucket(hash, str, string_id_string_dict_hash_table_);
   if (string_id_string_dict_hash_table_[bucket] == INVALID_STR_ID) {
     CHECK_LT(str_count_, MAX_STRCOUNT)
         << "Maximum number (" << str_count_
         << ") of Dictionary encoded Strings reached for this column, offset path "
            "for column is  "
         << offsets_path_;
     appendToStorage(str);
     string_id_string_dict_hash_table_[bucket] = static_cast<int32_t>(str_count_);
     if (materialize_hashes_) {
       hash_cache_[str_count_] = hash;
     }
     ++str_count_;
     invalidateInvertedIndex();
   }
   return string_id_string_dict_hash_table_[bucket];
 }

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std::vector< int32_t > StringDictionary::getRegexpLike	(	const std::string &	pattern,
		const char	escape,
		const size_t	generation
	)		const

Definition at line 1099 of file StringDictionary.cpp.

References CHECK, CHECK_GT, CHECK_LE, client_, cpu_threads(), getStringUnlocked(), anonymous_namespace{StringDictionary.cpp}::is_regexp_like(), isClient(), regex_cache_, run_benchmark_import::result, rw_mutex_, and str_count_.

                                                                                     {
   std::lock_guard<std::shared_mutex> write_lock(rw_mutex_);
   if (isClient()) {
     return client_->get_regexp_like(pattern, escape, generation);
   }
   const auto cache_key = std::make_pair(pattern, escape);
   const auto it = regex_cache_.find(cache_key);
   if (it != regex_cache_.end()) {
     return it->second;
   }
   std::vector<int32_t> result;
   std::vector<std::thread> workers;
   int worker_count = cpu_threads();
   CHECK_GT(worker_count, 0);
   std::vector<std::vector<int32_t>> worker_results(worker_count);
   CHECK_LE(generation, str_count_);
   for (int worker_idx = 0; worker_idx < worker_count; ++worker_idx) {
     workers.emplace_back([&worker_results,
                           &pattern,
                           generation,
                           escape,
                           worker_idx,
                           worker_count,
                           this]() {
       for (size_t string_id = worker_idx; string_id < generation;
            string_id += worker_count) {
         const auto str = getStringUnlocked(string_id);
         if (is_regexp_like(str, pattern, escape)) {
           worker_results[worker_idx].push_back(string_id);
         }
       }
     });
   }
   for (auto& worker : workers) {
     worker.join();
   }
   for (const auto& worker_result : worker_results) {
     result.insert(result.end(), worker_result.begin(), worker_result.end());
   }
   const auto it_ok = regex_cache_.insert(std::make_pair(cache_key, result));
   CHECK(it_ok.second);
 
   return result;
 }

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std::string StringDictionary::getString ( int32_t string_id ) const

Definition at line 767 of file StringDictionary.cpp.

References client_, getStringUnlocked(), isClient(), and rw_mutex_.

Referenced by StringValueConverter::convertToColumnarFormatFromDict(), and populate_string_ids().

                                                              {
   std::shared_lock<std::shared_mutex> read_lock(rw_mutex_);
   if (isClient()) {
     std::string ret;
     client_->get_string(ret, string_id);
     return ret;
   }
   return getStringUnlocked(string_id);
 }

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std::pair< char *, size_t > StringDictionary::getStringBytes ( int32_t string_id ) const

noexcept

Definition at line 782 of file StringDictionary.cpp.

References CHECK, CHECK_LE, and CHECK_LT.

              {
   std::shared_lock<std::shared_mutex> read_lock(rw_mutex_);
   CHECK(!isClient());
   CHECK_LE(0, string_id);
   CHECK_LT(string_id, static_cast<int32_t>(str_count_));
   return getStringBytesChecked(string_id);
 }

std::pair< char *, size_t > StringDictionary::getStringBytesChecked ( const int string_id ) const

privatenoexcept

Definition at line 1303 of file StringDictionary.cpp.

References CHECK.

                                         {
   const auto str_canary = getStringFromStorage(string_id);
   CHECK(!str_canary.canary);
   return std::make_pair(str_canary.c_str_ptr, str_canary.size);
 }

std::string StringDictionary::getStringChecked ( const int string_id ) const

privatenoexcept

Definition at line 1297 of file StringDictionary.cpp.

References CHECK.

Referenced by increaseHashTableCapacity().

                                                                                {
   const auto str_canary = getStringFromStorage(string_id);
   CHECK(!str_canary.canary);
   return std::string(str_canary.c_str_ptr, str_canary.size);
 }

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StringDictionary::PayloadString StringDictionary::getStringFromStorage ( const int string_id ) const

privatenoexcept

Definition at line 1489 of file StringDictionary.cpp.

References CHECK_GE, StringDictionary::StringIdxEntry::off, and StringDictionary::StringIdxEntry::size.

Referenced by getCompare(), mergeSortedCache(), sortCache(), and StringDictionary().

                                         {
   if (!isTemp_) {
     CHECK_GE(payload_fd_, 0);
     CHECK_GE(offset_fd_, 0);
   }
   CHECK_GE(string_id, 0);
   const StringIdxEntry* str_meta = offset_map_ + string_id;
   if (str_meta->size == 0xffff) {
     // hit the canary
     return {nullptr, 0, true};
   }
   return {payload_map_ + str_meta->off, str_meta->size, false};
 }

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std::string_view StringDictionary::getStringFromStorageFast ( const int string_id ) const

privatenoexcept

Definition at line 1483 of file StringDictionary.cpp.

References StringDictionary::StringIdxEntry::off, and StringDictionary::StringIdxEntry::size.

Referenced by buildDictionaryTranslationMap(), eachStringSerially(), and getStringViews().

              {
   const StringIdxEntry* str_meta = offset_map_ + string_id;
   return {payload_map_ + str_meta->off, str_meta->size};
 }

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std::string StringDictionary::getStringUnlocked ( int32_t string_id ) const

privatenoexcept

Definition at line 777 of file StringDictionary.cpp.

References CHECK_LT.

Referenced by copyStrings(), getEquals(), getLike(), getRegexpLike(), and getString().

                                                                               {
   CHECK_LT(string_id, static_cast<int32_t>(str_count_));
   return getStringChecked(string_id);
 }

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std::vector< std::string_view > StringDictionary::getStringViews ( ) const

Definition at line 1771 of file StringDictionary.cpp.

References storageEntryCount().

                                                                  {
   return getStringViews(storageEntryCount());
 }

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std::vector< std::string_view > StringDictionary::getStringViews ( const size_t generation ) const

Definition at line 1717 of file StringDictionary.cpp.

References CHECK_GE, CHECK_LE, DEBUG_TIMER, getStringFromStorageFast(), MAX_STRCOUNT, ThreadInfo::num_elems_per_thread, ThreadInfo::num_threads, threading_serial::parallel_for(), rw_mutex_, and storageEntryCount().

                                    {
   auto timer = DEBUG_TIMER(__func__);
   std::shared_lock<std::shared_mutex> read_lock(rw_mutex_);
   const int64_t num_strings = generation >= 0 ? generation : storageEntryCount();
   CHECK_LE(num_strings, static_cast<int64_t>(StringDictionary::MAX_STRCOUNT));
   // The CHECK_LE below is currently redundant with the check
   // above against MAX_STRCOUNT, however given we iterate using
   // int32_t types for efficiency (to match type expected by
   // getStringFromStorageFast, check that the # of strings is also
   // in the int32_t range in case MAX_STRCOUNT is changed
 
   // Todo(todd): consider aliasing the max logical type width
   // (currently int32_t) throughout StringDictionary
   CHECK_LE(num_strings, std::numeric_limits<int32_t>::max());
 
   std::vector<std::string_view> string_views(num_strings);
   // We can bail early if the generation-specified dictionary is empty
   if (num_strings == 0) {
     return string_views;
   }
   constexpr int64_t tbb_parallel_threshold{1000};
   if (num_strings < tbb_parallel_threshold) {
     // Use int32_t to match type expected by getStringFromStorageFast
     for (int32_t string_idx = 0; string_idx < num_strings; ++string_idx) {
       string_views[string_idx] = getStringFromStorageFast(string_idx);
     }
   } else {
     constexpr int64_t target_strings_per_thread{1000};
     const ThreadInfo thread_info(
         std::thread::hardware_concurrency(), num_strings, target_strings_per_thread);
     CHECK_GE(thread_info.num_threads, 1L);
     CHECK_GE(thread_info.num_elems_per_thread, 1L);
 
     tbb::task_arena limited_arena(thread_info.num_threads);
     CHECK_LE(tbb::this_task_arena::max_concurrency(), thread_info.num_threads);
     limited_arena.execute([&] {
       tbb::parallel_for(
           tbb::blocked_range<int64_t>(
               0, num_strings, thread_info.num_elems_per_thread /* tbb grain_size */),
           [&](const tbb::blocked_range<int64_t>& r) {
             // r should be in range of int32_t per CHECK above
             const int32_t start_idx = r.begin();
             const int32_t end_idx = r.end();
             for (int32_t string_idx = start_idx; string_idx != end_idx; ++string_idx) {
               string_views[string_idx] = getStringFromStorageFast(string_idx);
             }
           },
           tbb::simple_partitioner());
     });
   }
   return string_views;
 }

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int32_t StringDictionary::getUnlocked ( const std::string_view sv ) const

privatenoexcept

Definition at line 760 of file StringDictionary.cpp.

References anonymous_namespace{StringDictionary.cpp}::hash_string().

Referenced by getIdOfString().

                                                                             {
   const string_dict_hash_t hash = hash_string(sv);
   auto str_id = string_id_string_dict_hash_table_[computeBucket(
       hash, sv, string_id_string_dict_hash_table_)];
   return str_id;
 }

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template<class String >

void StringDictionary::hashStrings	(	const std::vector< String > &	string_vec,
		std::vector< string_dict_hash_t > &	hashes
	)		const

privatenoexcept

Method to hash a vector of strings in parallel.

Parameters

string_vec	input vector of strings to be hashed
hashes	space for the output - should be pre-sized to match string_vec size

Definition at line 471 of file StringDictionary.cpp.

References CHECK_EQ, anonymous_namespace{StringDictionary.cpp}::hash_string(), and threading_serial::parallel_for().

Referenced by getOrAddBulkParallel().

              {
   CHECK_EQ(string_vec.size(), hashes.size());
 
   tbb::parallel_for(tbb::blocked_range<size_t>(0, string_vec.size()),
                     [&string_vec, &hashes](const tbb::blocked_range<size_t>& r) {
                       for (size_t curr_id = r.begin(); curr_id != r.end(); ++curr_id) {
                         if (string_vec[curr_id].empty()) {
                           continue;
                         }
                         hashes[curr_id] = hash_string(string_vec[curr_id]);
                       }
                     });
 }

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void StringDictionary::increaseHashTableCapacity ( )

privatenoexcept

Definition at line 1202 of file StringDictionary.cpp.

References computeUniqueBucketWithHash(), getStringChecked(), hash_cache_, anonymous_namespace{StringDictionary.cpp}::hash_string(), INVALID_STR_ID, materialize_hashes_, str_count_, and string_id_string_dict_hash_table_.

Referenced by getOrAddBulk().

                                                           {
   std::vector<int32_t> new_str_ids(string_id_string_dict_hash_table_.size() * 2,
                                    INVALID_STR_ID);
 
   if (materialize_hashes_) {
     for (size_t i = 0; i != str_count_; ++i) {
       const string_dict_hash_t hash = hash_cache_[i];
       const uint32_t bucket = computeUniqueBucketWithHash(hash, new_str_ids);
       new_str_ids[bucket] = i;
     }
     hash_cache_.resize(hash_cache_.size() * 2);
   } else {
     for (size_t i = 0; i != str_count_; ++i) {
       const auto str = getStringChecked(i);
       const string_dict_hash_t hash = hash_string(str);
       const uint32_t bucket = computeUniqueBucketWithHash(hash, new_str_ids);
       new_str_ids[bucket] = i;
     }
   }
   string_id_string_dict_hash_table_.swap(new_str_ids);
 }

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template<class String >

void StringDictionary::increaseHashTableCapacityFromStorageAndMemory	(	const size_t	str_count,
		const size_t	storage_high_water_mark,
		const std::vector< String > &	input_strings,
		const std::vector< size_t > &	string_memory_ids,
		const std::vector< string_dict_hash_t > &	input_strings_hashes
	)

privatenoexcept

Definition at line 1225 of file StringDictionary.cpp.

References anonymous_namespace{StringDictionary.cpp}::hash_string().

Referenced by getOrAddBulkParallel().

                                                                         {
   std::vector<int32_t> new_str_ids(string_id_string_dict_hash_table_.size() * 2,
                                    INVALID_STR_ID);
   if (materialize_hashes_) {
     for (size_t i = 0; i != str_count; ++i) {
       const string_dict_hash_t hash = hash_cache_[i];
       const uint32_t bucket = computeUniqueBucketWithHash(hash, new_str_ids);
       new_str_ids[bucket] = i;
     }
     hash_cache_.resize(hash_cache_.size() * 2);
   } else {
     for (size_t storage_idx = 0; storage_idx != storage_high_water_mark; ++storage_idx) {
       const auto storage_string = getStringChecked(storage_idx);
       const string_dict_hash_t hash = hash_string(storage_string);
       const uint32_t bucket = computeUniqueBucketWithHash(hash, new_str_ids);
       new_str_ids[bucket] = storage_idx;
     }
     for (size_t memory_idx = 0; memory_idx != string_memory_ids.size(); ++memory_idx) {
       const size_t string_memory_id = string_memory_ids[memory_idx];
       const uint32_t bucket = computeUniqueBucketWithHash(
           input_strings_hashes[string_memory_id], new_str_ids);
       new_str_ids[bucket] = storage_high_water_mark + memory_idx;
     }
   }
   string_id_string_dict_hash_table_.swap(new_str_ids);
 }

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void StringDictionary::insertInSortedCache	(	std::string	str,
		int32_t	str_id
	)

private

void StringDictionary::invalidateInvertedIndex ( )

privatenoexcept

Definition at line 1564 of file StringDictionary.cpp.

References compare_cache_, equal_cache_, like_cache_, regex_cache_, and gpu_enabled::swap().

Referenced by getOrAddBulk(), and getOrAddBulkParallel().

                                                         {
   if (!like_cache_.empty()) {
     decltype(like_cache_)().swap(like_cache_);
   }
   if (!regex_cache_.empty()) {
     decltype(regex_cache_)().swap(regex_cache_);
   }
   if (!equal_cache_.empty()) {
     decltype(equal_cache_)().swap(equal_cache_);
   }
   compare_cache_.invalidateInvertedIndex();
 }

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bool StringDictionary::isClient ( ) const

noexcept

Definition at line 1600 of file StringDictionary.cpp.

References client_.

Referenced by checkpoint(), copyStrings(), eachStringSerially(), getCompare(), getIdOfString(), getLike(), getRegexpLike(), getString(), makeLambdaStringToId(), storageEntryCount(), and ~StringDictionary().

                                                {
   return static_cast<bool>(client_);
 }

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std::function< int32_t(std::string const &)> StringDictionary::makeLambdaStringToId ( ) const

Definition at line 254 of file StringDictionary.cpp.

References CHECK, eachStringSerially(), INVALID_STR_ID, and isClient().

           {
   CHECK(isClient());
   constexpr size_t big_gen = static_cast<size_t>(std::numeric_limits<size_t>::max());
   MapMaker map_maker;
   eachStringSerially(big_gen, map_maker);
   return [map{map_maker.moveMap()}](std::string const& str) {
     auto const itr = map.find(str);
     return itr == map.cend() ? INVALID_STR_ID : itr->second;
   };
 }

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void StringDictionary::mergeSortedCache ( std::vector< int32_t > & temp_sorted_cache )

private

Definition at line 1628 of file StringDictionary.cpp.

References getStringFromStorage(), sorted_cache, and string_lt().

Referenced by buildSortedCache().

                                                                              {
   // this method is not thread safe
   std::vector<int32_t> updated_cache(temp_sorted_cache.size() + sorted_cache.size());
   size_t t_idx = 0, s_idx = 0, idx = 0;
   for (; t_idx < temp_sorted_cache.size() && s_idx < sorted_cache.size(); idx++) {
     auto t_string = getStringFromStorage(temp_sorted_cache[t_idx]);
     auto s_string = getStringFromStorage(sorted_cache[s_idx]);
     const auto insert_from_temp_cache =
         string_lt(t_string.c_str_ptr, t_string.size, s_string.c_str_ptr, s_string.size);
     if (insert_from_temp_cache) {
       updated_cache[idx] = temp_sorted_cache[t_idx++];
     } else {
       updated_cache[idx] = sorted_cache[s_idx++];
     }
   }
   while (t_idx < temp_sorted_cache.size()) {
     updated_cache[idx++] = temp_sorted_cache[t_idx++];
   }
   while (s_idx < sorted_cache.size()) {
     updated_cache[idx++] = sorted_cache[s_idx++];
   }
   sorted_cache.swap(updated_cache);
 }

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void StringDictionary::populate_string_array_ids	(	std::vector< std::vector< int32_t >> &	dest_array_ids,
		StringDictionary *	dest_dict,
		const std::vector< std::vector< int32_t >> &	source_array_ids,
		const StringDictionary *	source_dict
	)

static

Definition at line 1676 of file StringDictionary.cpp.

References threading_serial::async(), populate_string_ids(), and logger::thread_id().

Referenced by DictionaryValueConverter< TARGET_TYPE >::processArrayBuffer().

                                          {
   dest_array_ids.resize(source_array_ids.size());
 
   std::atomic<size_t> row_idx{0};
   auto processor = [&row_idx, &dest_array_ids, dest_dict, &source_array_ids, source_dict](
                        int thread_id) {
     for (;;) {
       auto row = row_idx.fetch_add(1);
 
       if (row >= dest_array_ids.size()) {
         return;
       }
       const auto& source_ids = source_array_ids[row];
       auto& dest_ids = dest_array_ids[row];
       populate_string_ids(dest_ids, dest_dict, source_ids, source_dict);
     }
   };
 
   const int num_worker_threads = std::thread::hardware_concurrency();
 
   if (source_array_ids.size() / num_worker_threads > 10) {
     std::vector<std::future<void>> worker_threads;
     for (int i = 0; i < num_worker_threads; ++i) {
       worker_threads.push_back(std::async(std::launch::async, processor, i));
     }
 
     for (auto& child : worker_threads) {
       child.wait();
     }
     for (auto& child : worker_threads) {
       child.get();
     }
   } else {
     processor(0);
   }
 }

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void StringDictionary::populate_string_ids	(	std::vector< int32_t > &	dest_ids,
		StringDictionary *	dest_dict,
		const std::vector< int32_t > &	source_ids,
		const StringDictionary *	source_dict,
		const std::vector< std::string const * > &	transient_string_vec = `{}`
	)

static

Populates provided dest_ids vector with string ids corresponding to given source strings.

Given a vector of source string ids and corresponding source dictionary, this method populates a vector of destination string ids by either returning the string id of matching strings in the destination dictionary or creating new entries in the dictionary. Source string ids can also be transient if they were created by a function (e.g LOWER/UPPER functions). A map of transient string ids to string values is provided in order to handle this use case.

Parameters

dest_ids	- vector of destination string ids to be populated
dest_dict	- destination dictionary
source_ids	- vector of source string ids for which destination ids are needed
source_dict	- source dictionary
transient_string_vec	- ordered vector of string value pointers

Definition at line 1652 of file StringDictionary.cpp.

References CHECK_LT, getOrAddBulk(), getString(), and StringDictionaryProxy::transientIdToIndex().

Referenced by populate_string_array_ids(), and DictionaryValueConverter< TARGET_TYPE >::processBuffer().

                                                              {
   std::vector<std::string> strings;
 
   for (const int32_t source_id : source_ids) {
     if (source_id == std::numeric_limits<int32_t>::min()) {
       strings.emplace_back("");
     } else if (source_id < 0) {
       unsigned const string_index = StringDictionaryProxy::transientIdToIndex(source_id);
       CHECK_LT(string_index, transient_string_vec.size()) << "source_id=" << source_id;
       strings.emplace_back(*transient_string_vec[string_index]);
     } else {
       strings.push_back(source_dict->getString(source_id));
     }
   }
 
   dest_ids.resize(strings.size());
   dest_dict->getOrAddBulk(strings, &dest_ids[0]);
 }

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void StringDictionary::processDictionaryFutures ( std::vector< std::future< std::vector< std::pair< string_dict_hash_t, unsigned int >>>> & dictionary_futures )

private

Definition at line 291 of file StringDictionary.cpp.

References computeUniqueBucketWithHash(), hash_cache_, materialize_hashes_, payload_file_off_, str_count_, and string_id_string_dict_hash_table_.

Referenced by StringDictionary().

                             {
   for (auto& dictionary_future : dictionary_futures) {
     dictionary_future.wait();
     const auto hashVec = dictionary_future.get();
     for (const auto& hash : hashVec) {
       const uint32_t bucket =
           computeUniqueBucketWithHash(hash.first, string_id_string_dict_hash_table_);
       payload_file_off_ += hash.second;
       string_id_string_dict_hash_table_[bucket] = static_cast<int32_t>(str_count_);
       if (materialize_hashes_) {
         hash_cache_[str_count_] = hash.first;
       }
       ++str_count_;
     }
   }
   dictionary_futures.clear();
 }

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void StringDictionary::sortCache ( std::vector< int32_t > & cache )

private

Definition at line 1615 of file StringDictionary.cpp.

References anonymous_namespace{Utm.h}::a, getStringFromStorage(), gpu_enabled::sort(), and string_lt().

Referenced by buildSortedCache().

                                                           {
   // This method is not thread-safe.
 
   // this boost sort is creating some problems when we use UTF-8 encoded strings.
   // TODO (vraj): investigate What is wrong with boost sort and try to mitigate it.
 
   std::sort(cache.begin(), cache.end(), [this](int32_t a, int32_t b) {
     auto a_str = this->getStringFromStorage(a);
     auto b_str = this->getStringFromStorage(b);
     return string_lt(a_str.c_str_ptr, a_str.size, b_str.c_str_ptr, b_str.size);
   });
 }

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size_t StringDictionary::storageEntryCount ( ) const

Definition at line 791 of file StringDictionary.cpp.

References client_, isClient(), rw_mutex_, and str_count_.

Referenced by buildDictionaryTranslationMap(), eachStringSerially(), getBulk(), and getStringViews().

                                                  {
   std::shared_lock<std::shared_mutex> read_lock(rw_mutex_);
   if (isClient()) {
     return client_->storage_entry_count();
   }
   return str_count_;
 }

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void StringDictionary::update_leaf ( const LeafHostInfo & host_info )

Definition at line 379 of file StringDictionary.cpp.

379 {

380 }

Friends And Related Function Documentation

friend class StringLocalCallback

friend

Definition at line 80 of file StringDictionary.h.

Member Data Documentation

char* StringDictionary::CANARY_BUFFER {nullptr}

private

Definition at line 287 of file StringDictionary.h.

Referenced by ~StringDictionary().

size_t StringDictionary::canary_buffer_size = 0

private

Definition at line 288 of file StringDictionary.h.

std::unique_ptr<StringDictionaryClient> StringDictionary::client_

mutableprivate

Definition at line 284 of file StringDictionary.h.

Referenced by checkpoint(), eachStringSerially(), getCompare(), getIdOfString(), getLike(), getRegexpLike(), getString(), isClient(), and storageEntryCount().

std::unique_ptr<StringDictionaryClient> StringDictionary::client_no_timeout_

mutableprivate

Definition at line 285 of file StringDictionary.h.

Referenced by buildDictionaryTranslationMap(), and getOrAddBulkArray().

size_t StringDictionary::collisions_

private

Definition at line 263 of file StringDictionary.h.

Referenced by StringDictionary().

DictionaryCache<std::string, compare_cache_value_t> StringDictionary::compare_cache_

mutableprivate

Definition at line 282 of file StringDictionary.h.

Referenced by getCompare(), and invalidateInvertedIndex().

const DictRef StringDictionary::dict_ref_

private

Definition at line 260 of file StringDictionary.h.

Referenced by getBulk(), getDbId(), getDictId(), getOrAddBulk(), and getOrAddBulkParallel().

std::map<std::string, int32_t> StringDictionary::equal_cache_

mutableprivate

Definition at line 281 of file StringDictionary.h.

Referenced by getEquals(), and invalidateInvertedIndex().

const std::string StringDictionary::folder_

private

Definition at line 261 of file StringDictionary.h.

std::vector<string_dict_hash_t> StringDictionary::hash_cache_

private

Definition at line 265 of file StringDictionary.h.

Referenced by buildDictionaryTranslationMap(), getOrAddBulk(), getOrAddBulkParallel(), increaseHashTableCapacity(), processDictionaryFutures(), and StringDictionary().

constexpr int32_t StringDictionary::INVALID_STR_ID = -1

static

Definition at line 168 of file StringDictionary.h.

bool StringDictionary::isTemp_

private

Definition at line 267 of file StringDictionary.h.

Referenced by checkAndConditionallyIncreaseOffsetCapacity(), checkAndConditionallyIncreasePayloadCapacity(), checkpoint(), StringDictionary(), and ~StringDictionary().

std::map<std::tuple<std::string, bool, bool, char>, std::vector<int32_t> > StringDictionary::like_cache_

mutableprivate

Definition at line 279 of file StringDictionary.h.

Referenced by getLike(), and invalidateInvertedIndex().

bool StringDictionary::materialize_hashes_

private

Definition at line 268 of file StringDictionary.h.

Referenced by buildDictionaryTranslationMap(), getOrAddBulk(), getOrAddBulkParallel(), increaseHashTableCapacity(), processDictionaryFutures(), and StringDictionary().

constexpr size_t StringDictionary::MAX_STRCOUNT = (1U << 31) - 1

static

Definition at line 170 of file StringDictionary.h.

Referenced by getOrAddBulk(), getOrAddBulkParallel(), getStringViews(), and anonymous_namespace{StringDictionary.cpp}::throw_encoding_error().

constexpr size_t StringDictionary::MAX_STRLEN = (1 << 15) - 1

static

Definition at line 169 of file StringDictionary.h.

Referenced by import_export::TypedImportBuffer::add_value(), import_export::TypedImportBuffer::addDefaultValues(), import_export::TypedImportBuffer::addDictEncodedString(), import_export::TypedImportBuffer::addDictEncodedStringArray(), foreign_storage::ParquetStringNoneEncoder::appendData(), foreign_storage::ParquetDetectStringEncoder::appendData(), foreign_storage::ParquetStringEncoder< V >::appendDataTrackErrors(), foreign_storage::ParquetStringEncoder< V >::encodeAndCopyContiguous(), getBulk(), getEquals(), getOrAddBulk(), getOrAddBulkParallel(), import_export::delimited_parser::parse_string_array(), foreign_storage::RegexFileBufferParser::parseBuffer(), anonymous_namespace{StringDictionary.cpp}::throw_string_too_long_error(), foreign_storage::ParquetDetectStringEncoder::validate(), ddl_utils::anonymous_namespace{DdlUtils.cpp}::validate_literal(), and foreign_storage::ParquetStringEncoder< V >::validateAndAppendData().

int StringDictionary::offset_fd_

private

Definition at line 271 of file StringDictionary.h.

Referenced by checkAndConditionallyIncreaseOffsetCapacity(), checkpoint(), StringDictionary(), and ~StringDictionary().

size_t StringDictionary::offset_file_size_

private

Definition at line 274 of file StringDictionary.h.

Referenced by checkAndConditionallyIncreaseOffsetCapacity(), checkpoint(), StringDictionary(), and ~StringDictionary().

StringIdxEntry* StringDictionary::offset_map_

private

Definition at line 272 of file StringDictionary.h.

Referenced by checkAndConditionallyIncreaseOffsetCapacity(), checkpoint(), StringDictionary(), and ~StringDictionary().

std::string StringDictionary::offsets_path_

private

Definition at line 269 of file StringDictionary.h.

Referenced by getOrAddBulk(), getOrAddBulkParallel(), and StringDictionary().

int StringDictionary::payload_fd_

private

Definition at line 270 of file StringDictionary.h.

Referenced by checkAndConditionallyIncreasePayloadCapacity(), checkpoint(), StringDictionary(), and ~StringDictionary().

size_t StringDictionary::payload_file_off_

private

Definition at line 276 of file StringDictionary.h.

Referenced by checkAndConditionallyIncreasePayloadCapacity(), and processDictionaryFutures().

size_t StringDictionary::payload_file_size_

private

Definition at line 275 of file StringDictionary.h.

Referenced by checkAndConditionallyIncreasePayloadCapacity(), checkpoint(), StringDictionary(), and ~StringDictionary().

char* StringDictionary::payload_map_

private

Definition at line 273 of file StringDictionary.h.

Referenced by checkAndConditionallyIncreasePayloadCapacity(), checkpoint(), StringDictionary(), and ~StringDictionary().

std::map<std::pair<std::string, char>, std::vector<int32_t> > StringDictionary::regex_cache_

mutableprivate

Definition at line 280 of file StringDictionary.h.

Referenced by getRegexpLike(), and invalidateInvertedIndex().

std::shared_mutex StringDictionary::rw_mutex_

mutableprivate

Definition at line 277 of file StringDictionary.h.

Referenced by buildDictionaryTranslationMap(), copyStrings(), eachStringSerially(), getBulk(), getCompare(), getIdOfString(), getLike(), getOrAddBulk(), getOrAddBulkParallel(), getRegexpLike(), getString(), getStringViews(), storageEntryCount(), and StringDictionary().

std::vector<int32_t> StringDictionary::sorted_cache

private

Definition at line 266 of file StringDictionary.h.

Referenced by buildSortedCache(), getCompare(), and mergeSortedCache().

size_t StringDictionary::str_count_

private

Definition at line 262 of file StringDictionary.h.

Referenced by buildDictionaryTranslationMap(), buildSortedCache(), checkAndConditionallyIncreaseOffsetCapacity(), copyStrings(), eachStringSerially(), getCompare(), getEquals(), getLike(), getOrAddBulk(), getOrAddBulkParallel(), getRegexpLike(), increaseHashTableCapacity(), processDictionaryFutures(), storageEntryCount(), and StringDictionary().

std::vector<int32_t> StringDictionary::string_id_string_dict_hash_table_

private

Definition at line 264 of file StringDictionary.h.

Referenced by buildDictionaryTranslationMap(), getBulk(), getOrAddBulk(), getOrAddBulkParallel(), increaseHashTableCapacity(), processDictionaryFutures(), and StringDictionary().

std::shared_ptr<std::vector<std::string> > StringDictionary::strings_cache_

mutableprivate

Definition at line 283 of file StringDictionary.h.

Referenced by copyStrings().

The documentation for this class was generated from the following files:

/home/jenkins-slave/workspace/core-os-doxygen/StringDictionary/StringDictionary.h
/home/jenkins-slave/workspace/core-os-doxygen/StringDictionary/StringDictionary.cpp

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