#include <ParquetStringEncoder.h>

Inheritance diagram for foreign_storage::ParquetStringEncoder< V >:

Collaboration diagram for foreign_storage::ParquetStringEncoder< V >:

Public Member Functions
	ParquetStringEncoder (Data_Namespace::AbstractBuffer buffer, StringDictionary string_dictionary, std::unique_ptr< ChunkMetadata > &chunk_metadata)

void	appendData (const int16_t def_levels, const int16_t rep_levels, const int64_t values_read, const int64_t levels_read, const bool is_last_batch, int8_t *values) override

void	encodeAndCopyContiguous (const int8_t parquet_data_bytes, int8_t omnisci_data_bytes, const size_t num_elements) override

void	encodeAndCopy (const int8_t parquet_data_bytes, int8_t omnisci_data_bytes) override

Public Member Functions inherited from foreign_storage::TypedParquetInPlaceEncoder< V, V >
	TypedParquetInPlaceEncoder (Data_Namespace::AbstractBuffer buffer, const ColumnDescriptor column_desciptor, const parquet::ColumnDescriptor *parquet_column_descriptor)

	TypedParquetInPlaceEncoder (Data_Namespace::AbstractBuffer *buffer, const size_t omnisci_data_type_byte_size, const size_t parquet_data_type_byte_size)

void	appendData (const int16_t def_levels, const int16_t rep_levels, const int64_t values_read, const int64_t levels_read, const bool is_last_batch, int8_t *values) override

void	encodeAndCopyContiguous (const int8_t parquet_data_bytes, int8_t omnisci_data_bytes, const size_t num_elements) override

void	setNull (int8_t *omnisci_data_bytes) override

void	copy (const int8_t omnisci_data_bytes_source, int8_t omnisci_data_bytes_destination) override

Public Member Functions inherited from foreign_storage::ParquetInPlaceEncoder
	ParquetInPlaceEncoder (Data_Namespace::AbstractBuffer *buffer, const size_t omnisci_data_type_byte_size, const size_t parquet_data_type_byte_size)

Public Member Functions inherited from foreign_storage::ParquetScalarEncoder
	ParquetScalarEncoder (Data_Namespace::AbstractBuffer *buffer)

Public Member Functions inherited from foreign_storage::ParquetEncoder
	ParquetEncoder (Data_Namespace::AbstractBuffer *buffer)

virtual	~ParquetEncoder ()=default

Protected Member Functions
bool	encodingIsIdentityForSameTypes () const override

Private Member Functions
void	updateMetadataStats (int64_t values_read, int8_t *values)

Private Attributes
StringDictionary *	string_dictionary_

std::unique_ptr< ChunkMetadata > &	chunk_metadata_

std::vector< int8_t >	encode_buffer_

V	min_

V	max_

Additional Inherited Members
Protected Attributes inherited from foreign_storage::ParquetInPlaceEncoder
const size_t	omnisci_data_type_byte_size_

Protected Attributes inherited from foreign_storage::ParquetEncoder
Data_Namespace::AbstractBuffer *	buffer_

Detailed Description

template<typename V>
class foreign_storage::ParquetStringEncoder< V >

Definition at line 29 of file ParquetStringEncoder.h.

Constructor & Destructor Documentation

◆ ParquetStringEncoder()

template<typename V >

foreign_storage::ParquetStringEncoder< V >::ParquetStringEncoder	(	Data_Namespace::AbstractBuffer *	buffer,
		StringDictionary *	string_dictionary,
		std::unique_ptr< ChunkMetadata > &	chunk_metadata
	)

inline

Definition at line 31 of file ParquetStringEncoder.h.

       : TypedParquetInPlaceEncoder<V, V>(buffer, sizeof(V), sizeof(V))
       , string_dictionary_(string_dictionary)
       , chunk_metadata_(chunk_metadata)
       , encode_buffer_(LazyParquetChunkLoader::batch_reader_num_elements * sizeof(V))
       , min_(std::numeric_limits<V>::max())
       , max_(std::numeric_limits<V>::lowest()) {}

Member Function Documentation

◆ appendData()

template<typename V >

void foreign_storage::ParquetStringEncoder< V >::appendData	(	const int16_t *	def_levels,
		const int16_t *	rep_levels,
		const int64_t	values_read,
		const int64_t	levels_read,
		const bool	is_last_batch,
		int8_t *	values
	)

inlineoverridevirtual

Appends Parquet data to the buffer using an in-place algorithm. Any necessary transformation or validation of the data and decoding of nulls is part of appending the data. Each class inheriting from this abstract class must implement the functionality to copy, nullify and encode the data.

Parameters

def_levels	- an array containing the Dremel encoding definition levels
rep_levels	- an array containing the Dremel encoding repetition levels
values_read	- the number of non-null values read
levels_read	- the total number of values (non-null & null) that are read
is_last_batch	- flag indicating if this is the last read for the row group
values	- values that are read

Note that the Parquet format encodes nulls using Dremel encoding.

Reimplemented from foreign_storage::ParquetInPlaceEncoder.

Definition at line 41 of file ParquetStringEncoder.h.

References foreign_storage::TypedParquetInPlaceEncoder< V, T >::appendData(), foreign_storage::ParquetStringEncoder< V >::encode_buffer_, and foreign_storage::ParquetStringEncoder< V >::encodeAndCopyContiguous().

                                            {
     encodeAndCopyContiguous(values, encode_buffer_.data(), values_read);
     TypedParquetInPlaceEncoder<V, V>::appendData(def_levels,
                                                  rep_levels,
                                                  values_read,
                                                  levels_read,
                                                  is_last_batch,
                                                  encode_buffer_.data());
   }

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◆ encodeAndCopy()

template<typename V >

void foreign_storage::ParquetStringEncoder< V >::encodeAndCopy	(	const int8_t *	parquet_data_bytes,
		int8_t *	omnisci_data_bytes
	)

inlineoverridevirtual

Implements foreign_storage::ParquetScalarEncoder.

Definition at line 73 of file ParquetStringEncoder.h.

References foreign_storage::TypedParquetInPlaceEncoder< V, T >::copy().

                                                           {
     TypedParquetInPlaceEncoder<V, V>::copy(parquet_data_bytes, omnisci_data_bytes);
   }

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◆ encodeAndCopyContiguous()

template<typename V >

void foreign_storage::ParquetStringEncoder< V >::encodeAndCopyContiguous	(	const int8_t *	parquet_data_bytes,
		int8_t *	omnisci_data_bytes,
		const size_t	num_elements
	)

inlineoverridevirtual

Implements foreign_storage::ParquetScalarEncoder.

Definition at line 56 of file ParquetStringEncoder.h.

References StringDictionary::getOrAddBulk(), foreign_storage::ParquetStringEncoder< V >::string_dictionary_, and foreign_storage::ParquetStringEncoder< V >::updateMetadataStats().

Referenced by foreign_storage::ParquetStringEncoder< V >::appendData().

                                                                    {
     auto parquet_data_ptr =
         reinterpret_cast<const parquet::ByteArray*>(parquet_data_bytes);
     auto omnisci_data_ptr = reinterpret_cast<V*>(omnisci_data_bytes);
     std::vector<std::string_view> string_views;
     string_views.reserve(num_elements);
     for (size_t i = 0; i < num_elements; ++i) {
       auto& byte_array = parquet_data_ptr[i];
       string_views.emplace_back(reinterpret_cast<const char*>(byte_array.ptr),
                                 byte_array.len);
     }
     string_dictionary_->getOrAddBulk(string_views, omnisci_data_ptr);
     updateMetadataStats(num_elements, omnisci_data_bytes);
   }

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◆ encodingIsIdentityForSameTypes()

template<typename V >

bool foreign_storage::ParquetStringEncoder< V >::encodingIsIdentityForSameTypes ( ) const

inlineoverrideprotectedvirtual

Reimplemented from foreign_storage::TypedParquetInPlaceEncoder< V, V >.

Definition at line 79 of file ParquetStringEncoder.h.

79 { return true; }

◆ updateMetadataStats()

template<typename V >

void foreign_storage::ParquetStringEncoder< V >::updateMetadataStats	(	int64_t	values_read,
		int8_t *	values
	)

inlineprivate

Definition at line 82 of file ParquetStringEncoder.h.

References foreign_storage::ParquetStringEncoder< V >::chunk_metadata_, foreign_storage::ParquetStringEncoder< V >::max_, and foreign_storage::ParquetStringEncoder< V >::min_.

Referenced by foreign_storage::ParquetStringEncoder< V >::encodeAndCopyContiguous().

                                                                 {
     V* data_ptr = reinterpret_cast<V*>(values);
     for (int64_t i = 0; i < values_read; ++i) {
       min_ = std::min<V>(data_ptr[i], min_);
       max_ = std::max<V>(data_ptr[i], max_);
     }
     chunk_metadata_->fillChunkStats(min_, max_, false);
   }