ExpressionRewrite.h File Reference

#include <llvm/IR/Value.h>
#include <boost/optional.hpp>
#include <list>
#include <memory>
#include <vector>
#include "Analyzer/Analyzer.h"
#include "RelAlgExecutionUnit.h"

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Classes
struct	OverlapsJoinConjunction
struct	OverlapsJoinSupportedFunction

Namespaces
	Analyzer

Enumerations
enum	OverlapsJoinRewriteType { OverlapsJoinRewriteType::OVERLAPS_JOIN, OverlapsJoinRewriteType::RANGE_JOIN, OverlapsJoinRewriteType::UNKNOWN }

Functions
Analyzer::ExpressionPtr	rewrite_expr (const Analyzer::Expr *)
Analyzer::ExpressionPtr	rewrite_array_elements (const Analyzer::Expr *)
boost::optional < OverlapsJoinConjunction >	rewrite_overlaps_conjunction (const std::shared_ptr< Analyzer::Expr > expr, const std::vector< InputDescriptor > &input_table_info, const OverlapsJoinRewriteType rewrite_type, const Executor *executor)
boost::optional < OverlapsJoinConjunction >	convert_to_range_join_oper (const std::shared_ptr< Analyzer::Expr > expr, const Analyzer::BinOper *range_join_expr, const Analyzer::GeoOperator *lhs, const Analyzer::Constant *rhs)
std::list< std::shared_ptr < Analyzer::Expr > >	strip_join_covered_filter_quals (const std::list< std::shared_ptr< Analyzer::Expr >> &quals, const JoinQualsPerNestingLevel &join_quals)
std::shared_ptr< Analyzer::Expr >	fold_expr (const Analyzer::Expr *)
bool	self_join_not_covered_by_left_deep_tree (const Analyzer::ColumnVar *lhs, const Analyzer::ColumnVar *rhs, const int max_rte_covered)
const int	get_max_rte_scan_table (std::unordered_map< int, llvm::Value * > &scan_idx_to_hash_pos)

Enumeration Type Documentation

enum OverlapsJoinRewriteType

strong

Enumerator
OVERLAPS_JOIN
RANGE_JOIN
UNKNOWN

Definition at line 51 of file ExpressionRewrite.h.

{ OVERLAPS_JOIN, RANGE_JOIN, UNKNOWN };

Function Documentation

boost::optional<OverlapsJoinConjunction> convert_to_range_join_oper	(	const std::shared_ptr< Analyzer::Expr >	expr,
		const Analyzer::BinOper *	range_join_expr,
		const Analyzer::GeoOperator *	lhs,
		const Analyzer::Constant *	rhs
	)

Referenced by rewrite_overlaps_conjunction().

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std::shared_ptr<Analyzer::Expr> fold_expr

(

const Analyzer::Expr *

)

Definition at line 1143 of file ExpressionRewrite.cpp.

References kBIGINT, and anonymous_namespace{ExpressionRewrite.cpp}::strip_likelihood().

Referenced by RelAlgExecutor::createFilterWorkUnit(), RelAlgExecutor::makeJoinQuals(), anonymous_namespace{RelAlgExecutor.cpp}::set_transient_dict_maybe(), anonymous_namespace{RelAlgExecutor.cpp}::translate_quals(), anonymous_namespace{RelAlgExecutor.cpp}::translate_scalar_sources(), anonymous_namespace{RelAlgExecutor.cpp}::translate_targets(), RelAlgTranslator::translateBinaryGeoFunction(), RelAlgTranslator::translateDatePlusMinus(), RelAlgTranslator::translateGeoComparison(), and RelAlgTranslator::translateGeoFunctionArg().

                                                                {
  if (!expr) {
    return nullptr;
  }
  const auto expr_no_likelihood = strip_likelihood(expr);
  ConstantFoldingVisitor visitor;
  auto rewritten_expr = visitor.visit(expr_no_likelihood);
  if (visitor.get_num_overflows() > 0 && rewritten_expr->get_type_info().is_integer() &&
      rewritten_expr->get_type_info().get_type() != kBIGINT) {
    auto rewritten_expr_const =
        std::dynamic_pointer_cast<const Analyzer::Constant>(rewritten_expr);
    if (!rewritten_expr_const) {
      // Integer expression didn't fold completely the first time due to
      // overflows in smaller type subexpressions, trying again with a cast
      const auto& ti = SQLTypeInfo(kBIGINT, false);
      auto bigint_expr_no_likelihood = expr_no_likelihood->deep_copy()->add_cast(ti);
      auto rewritten_expr_take2 = visitor.visit(bigint_expr_no_likelihood.get());
      auto rewritten_expr_take2_const =
          std::dynamic_pointer_cast<Analyzer::Constant>(rewritten_expr_take2);
      if (rewritten_expr_take2_const) {
        // Managed to fold, switch to the new constant
        rewritten_expr = rewritten_expr_take2_const;
      }
    }
  }
  const auto expr_with_likelihood = dynamic_cast<const Analyzer::LikelihoodExpr*>(expr);
  if (expr_with_likelihood) {
    // Add back likelihood
    return std::make_shared<Analyzer::LikelihoodExpr>(
        rewritten_expr, expr_with_likelihood->get_likelihood());
  }
  return rewritten_expr;
}

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const int get_max_rte_scan_table

(

std::unordered_map< int, llvm::Value * > &

scan_idx_to_hash_pos

)

Definition at line 1188 of file ExpressionRewrite.cpp.

Referenced by BaselineJoinHashTable::codegenKey(), PerfectJoinHashTable::codegenMatchingSet(), and PerfectJoinHashTable::codegenSlot().

                                                             {
  int ret = INT32_MIN;
  for (auto& kv : scan_idx_to_hash_pos) {
    if (kv.first > ret) {
      ret = kv.first;
    }
  }
  return ret;
}

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Analyzer::ExpressionPtr rewrite_array_elements

(

const Analyzer::Expr *

)

Definition at line 757 of file ExpressionRewrite.cpp.

Referenced by anonymous_namespace{RelAlgExecutor.cpp}::translate_scalar_sources(), and anonymous_namespace{RelAlgExecutor.cpp}::translate_scalar_sources_for_update().

                                                                       {
  return ArrayElementStringLiteralEncodingVisitor().visit(expr);
}

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Analyzer::ExpressionPtr rewrite_expr

(

const Analyzer::Expr *

)

Definition at line 761 of file ExpressionRewrite.cpp.

References rewrite_avg_window(), rewrite_sum_window(), and anonymous_namespace{ExpressionRewrite.cpp}::strip_likelihood().

Referenced by RelAlgExecutor::createFilterWorkUnit(), qual_to_conjunctive_form(), qual_to_disjunctive_form(), anonymous_namespace{RelAlgExecutor.cpp}::rewrite_quals(), QueryRewriter::rewriteConstrainedByIn(), anonymous_namespace{RelAlgExecutor.cpp}::translate_scalar_sources(), anonymous_namespace{RelAlgExecutor.cpp}::translate_scalar_sources_for_update(), and anonymous_namespace{RelAlgExecutor.cpp}::translate_targets().

                                                             {
  const auto sum_window = rewrite_sum_window(expr);
  if (sum_window) {
    return sum_window;
  }
  const auto avg_window = rewrite_avg_window(expr);
  if (avg_window) {
    return avg_window;
  }
  const auto expr_no_likelihood = strip_likelihood(expr);
  // The following check is not strictly needed, but seems silly to transform a
  // simple string comparison to an IN just to codegen the same thing anyway.

  RecursiveOrToInVisitor visitor;
  auto rewritten_expr = visitor.visit(expr_no_likelihood);
  const auto expr_with_likelihood =
      std::dynamic_pointer_cast<const Analyzer::LikelihoodExpr>(rewritten_expr);
  if (expr_with_likelihood) {
    // Add back likelihood
    return std::make_shared<Analyzer::LikelihoodExpr>(
        rewritten_expr, expr_with_likelihood->get_likelihood());
  }
  return rewritten_expr;
}

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boost::optional<OverlapsJoinConjunction> rewrite_overlaps_conjunction	(	const std::shared_ptr< Analyzer::Expr >	expr,
		const std::vector< InputDescriptor > &	input_table_info,
		const OverlapsJoinRewriteType	rewrite_type,
		const Executor *	executor
	)

Definition at line 786 of file ExpressionRewrite.cpp.

References run_benchmark_import::args, cat(), CHECK, CHECK_EQ, CHECK_GE, Analyzer::Expr::collect_rte_idx(), convert_to_range_join_oper(), g_enable_hashjoin_many_to_many, logger::INFO, is_constructed_point(), OverlapsJoinSupportedFunction::is_many_to_many_func(), OverlapsJoinSupportedFunction::is_point_poly_rewrite_target_func(), OverlapsJoinSupportedFunction::is_poly_mpoly_rewrite_target_func(), OverlapsJoinSupportedFunction::is_poly_point_rewrite_target_func(), OverlapsJoinSupportedFunction::is_range_join_rewrite_target_func(), kARRAY, kBOOLEAN, kDOUBLE, kGEOGRAPHY, kLE, kONE, kOVERLAPS, kPOINT, LOG, OVERLAPS_JOIN, RANGE_JOIN, OverlapsJoinSupportedFunction::ST_APPROX_OVERLAPS_MULTIPOLYGON_POINT_sv, OverlapsJoinSupportedFunction::ST_DISTANCE_sv, OverlapsJoinSupportedFunction::ST_DWITHIN_POINT_POINT_sv, OverlapsJoinSupportedFunction::ST_OVERLAPS_sv, ScalarExprVisitor< T >::visit(), VLOG, and logger::WARNING.

Referenced by QueryRewriter::rewriteOverlapsJoin().

                              {
  auto collect_table_cardinality = [](const Analyzer::Expr* lhs,
                                      const Analyzer::Expr* rhs,
                                      const Executor* executor) {
    const auto lhs_cv = dynamic_cast<const Analyzer::ColumnVar*>(lhs);
    const auto rhs_cv = dynamic_cast<const Analyzer::ColumnVar*>(rhs);
    if (lhs_cv && rhs_cv) {
      const auto cat = executor->getCatalog();
      const auto inner_table_metadata = cat->getMetadataForTable(lhs_cv->get_table_id());
      const auto outer_table_metadata = cat->getMetadataForTable(rhs_cv->get_table_id());
      if (inner_table_metadata->fragmenter && outer_table_metadata->fragmenter) {
        return std::make_pair<int64_t, int64_t>(
            inner_table_metadata->fragmenter->getNumRows(),
            outer_table_metadata->fragmenter->getNumRows());
      }
    }
    // otherwise, return an invalid table cardinality
    return std::make_pair<int64_t, int64_t>(-1, -1);
  };

  auto has_invalid_join_col_order = [](const Analyzer::Expr* lhs,
                                       const Analyzer::Expr* rhs) {
    // Check for compatible join ordering. If the join ordering does not match expected
    // ordering for overlaps, the join builder will fail.
    std::set<int> lhs_rte_idx;
    lhs->collect_rte_idx(lhs_rte_idx);
    CHECK(!lhs_rte_idx.empty());
    std::set<int> rhs_rte_idx;
    rhs->collect_rte_idx(rhs_rte_idx);
    CHECK(!rhs_rte_idx.empty());
    auto has_invalid_num_join_cols = lhs_rte_idx.size() > 1 || rhs_rte_idx.size() > 1;
    auto has_invalid_rte_idx = lhs_rte_idx > rhs_rte_idx;
    return std::make_pair(has_invalid_num_join_cols || has_invalid_rte_idx,
                          has_invalid_rte_idx);
  };

  auto convert_to_range_join_oper =
      [&](std::string_view func_name,
          const std::shared_ptr<Analyzer::Expr> expr,
          const Analyzer::BinOper* range_join_expr,
          const Analyzer::GeoOperator* lhs,
          const Analyzer::Constant* rhs,
          const Executor* executor) -> std::shared_ptr<Analyzer::BinOper> {
    if (OverlapsJoinSupportedFunction::is_range_join_rewrite_target_func(func_name)) {
      CHECK_EQ(lhs->size(), size_t(2));
      auto l_arg = lhs->getOperand(0);
      auto r_arg = lhs->getOperand(1);
      const bool is_geography = l_arg->get_type_info().get_subtype() == kGEOGRAPHY ||
                                r_arg->get_type_info().get_subtype() == kGEOGRAPHY;
      if (is_geography) {
        VLOG(1) << "Range join not yet supported for geodesic distance "
                << expr->toString();
        return nullptr;
      }

      // Check for compatible join ordering. If the join ordering does not match expected
      // ordering for overlaps, the join builder will fail.
      Analyzer::Expr* range_join_arg = r_arg;
      Analyzer::Expr* bin_oper_arg = l_arg;
      auto invalid_range_join_qual =
          has_invalid_join_col_order(bin_oper_arg, range_join_arg);
      if (invalid_range_join_qual.second &&
          collect_table_cardinality(range_join_arg, bin_oper_arg, executor).first > 0 &&
          lhs->getOperand(0)->get_type_info().get_type() == kPOINT) {
        r_arg = lhs->getOperand(0);
        l_arg = lhs->getOperand(1);
        VLOG(1) << "Swap range join qual's input arguments to exploit overlaps "
                   "hash join framework";
        invalid_range_join_qual.first = false;
      }

      if (invalid_range_join_qual.first) {
        LOG(INFO) << "Unable to rewrite " << func_name
                  << " to overlaps conjunction. Cannot build hash table over LHS type. "
                     "Check join order.\n"
                  << range_join_expr->toString();
        return nullptr;
      }

      const bool inclusive = range_join_expr->get_optype() == kLE;
      auto range_expr = makeExpr<Analyzer::RangeOper>(
          inclusive, inclusive, r_arg->deep_copy(), rhs->deep_copy());
      VLOG(1) << "Successfully converted to overlaps join";
      return makeExpr<Analyzer::BinOper>(
          kBOOLEAN, kOVERLAPS, kONE, l_arg->deep_copy(), range_expr);
    }
    return nullptr;
  };

  /*
   * Currently, our overlaps hash join framework supports limited join quals especially
   * when 1) the FunctionOperator is listed in the function list, i.e.,
   * is_overlaps_supported_func, 2) the argument order of the join qual must match the
   * input argument order of the corresponding native function, and 3) input tables match
   * rte index requirement (the column used to build a hash table has larger rte compared
   * with that of probing column) And depending on the type of the function, we try to
   * convert it to corresponding overlaps hash join qual if possible After rewriting, we
   * create an overlaps join operator which is converted from the original expression and
   * return OverlapsJoinConjunction object which is a pair of 1) the original expr and 2)
   * converted overlaps join expr Here, returning the original expr means we additionally
   * call its corresponding native function to compute the result accurately (i.e.,
   * overlaps hash join operates a kind of filter expression which may include
   * false-positive of the true resultset) Note that ST_Overlaps is the only function that
   * does not return the original expr
   * */
  std::shared_ptr<Analyzer::BinOper> overlaps_oper{nullptr};
  bool needs_to_return_original_expr = false;
  std::string func_name{""};
  if (rewrite_type == OverlapsJoinRewriteType::OVERLAPS_JOIN) {
    auto func_oper = dynamic_cast<Analyzer::FunctionOper*>(expr.get());
    CHECK(func_oper);
    func_name = func_oper->getName();
    if (!g_enable_hashjoin_many_to_many &&
        OverlapsJoinSupportedFunction::is_many_to_many_func(func_name)) {
      LOG(WARNING) << "Many-to-many hashjoin support is disabled, unable to rewrite "
                   << func_oper->toString() << " to use accelerated geo join.";
      return boost::none;
    }
    DeepCopyVisitor deep_copy_visitor;
    if (func_name == OverlapsJoinSupportedFunction::ST_OVERLAPS_sv) {
      CHECK_GE(func_oper->getArity(), size_t(2));
      // this case returns {empty quals, overlaps join quals} b/c our join key matching
      // logic for this case is the same as the implementation of ST_Overlaps function
      // Note that we can build an overlaps join hash table regardless of table ordering
      // and the argument order in this case b/c selecting lhs and rhs by arguments 0
      // and 1 always match the rte index requirement (rte_lhs < rte_rhs)
      // so what table ordering we take, the rte index requirement satisfies
      // TODO(adb): we will likely want to actually check for true overlaps, but this
      // works for now
      auto lhs = func_oper->getOwnArg(0);
      auto rewritten_lhs = deep_copy_visitor.visit(lhs.get());
      CHECK(rewritten_lhs);

      auto rhs = func_oper->getOwnArg(1);
      auto rewritten_rhs = deep_copy_visitor.visit(rhs.get());
      CHECK(rewritten_rhs);
      overlaps_oper = makeExpr<Analyzer::BinOper>(
          kBOOLEAN, kOVERLAPS, kONE, rewritten_lhs, rewritten_rhs);
    } else if (func_name == OverlapsJoinSupportedFunction::ST_DWITHIN_POINT_POINT_sv) {
      CHECK_EQ(func_oper->getArity(), size_t(8));
      const auto lhs = func_oper->getOwnArg(0);
      const auto rhs = func_oper->getOwnArg(1);
      // the correctness of geo args used in the ST_DWithin function is checked by
      // geo translation logic, i.e., RelAlgTranslator::translateTernaryGeoFunction
      const auto distance_const_val =
          dynamic_cast<const Analyzer::Constant*>(func_oper->getArg(7));
      if (lhs && rhs && distance_const_val) {
        std::vector<std::shared_ptr<Analyzer::Expr>> args{lhs, rhs};
        auto range_oper = makeExpr<Analyzer::GeoOperator>(
            SQLTypeInfo(kDOUBLE, 0, 8, true),
            OverlapsJoinSupportedFunction::ST_DISTANCE_sv.data(),
            args,
            std::nullopt);
        auto distance_oper = makeExpr<Analyzer::BinOper>(
            kBOOLEAN, kLE, kONE, range_oper, distance_const_val->deep_copy());
        VLOG(1) << "Rewrite " << func_oper->getName() << " to ST_Distance_Point_Point";
        overlaps_oper =
            convert_to_range_join_oper(OverlapsJoinSupportedFunction::ST_DISTANCE_sv,
                                       distance_oper,
                                       distance_oper.get(),
                                       range_oper.get(),
                                       distance_const_val,
                                       executor);
        needs_to_return_original_expr = true;
      }
    } else if (OverlapsJoinSupportedFunction::is_poly_mpoly_rewrite_target_func(
                   func_name)) {
      // in the five functions fall into this case,
      // ST_Contains is for a pair of polygons, and for ST_Intersect cases they are
      // combo of polygon and multipolygon so what table orders we choose, rte index
      // requirement for overlaps join can be satisfied if we choose lhs and rhs
      // from left-to-right order (i.e., get lhs from the arg-1 instead of arg-3)
      // Note that we choose them from right-to-left argument order in the past
      CHECK_GE(func_oper->getArity(), size_t(4));
      auto lhs = func_oper->getOwnArg(1);
      auto rewritten_lhs = deep_copy_visitor.visit(lhs.get());
      CHECK(rewritten_lhs);
      auto rhs = func_oper->getOwnArg(3);
      auto rewritten_rhs = deep_copy_visitor.visit(rhs.get());
      CHECK(rewritten_rhs);

      overlaps_oper = makeExpr<Analyzer::BinOper>(
          kBOOLEAN, kOVERLAPS, kONE, rewritten_lhs, rewritten_rhs);
      needs_to_return_original_expr = true;
    } else if (OverlapsJoinSupportedFunction::is_point_poly_rewrite_target_func(
                   func_name)) {
      // now, we try to look at one more chance to exploit overlaps hash join by
      // rewriting the qual as: ST_INTERSECT(POLY, POINT) -> ST_INTERSECT(POINT, POLY)
      // to support efficient evaluation of 1) ST_Intersects_Point_Polygon and
      // 2) ST_Intersects_Point_MultiPolygon based on our overlaps hash join framework
      // here, we have implementation of native functions for both 1) Point-Polygon pair
      // and 2) Polygon-Point pair, but we currently do not support hash table
      // generation on top of point column thus, the goal of this rewriting is to place
      // a non-point geometry to the right-side of the overlaps join operator (to build
      // hash table based on it) iff the inner table is larger than that of non-point
      // geometry (to reduce expensive hash join performance)
      size_t point_arg_idx = 0;
      size_t poly_arg_idx = 2;
      if (func_oper->getOwnArg(point_arg_idx)->get_type_info().get_type() != kPOINT) {
        point_arg_idx = 2;
        poly_arg_idx = 1;
      }
      auto point_cv = func_oper->getOwnArg(point_arg_idx);
      auto poly_cv = func_oper->getOwnArg(poly_arg_idx);
      CHECK_EQ(point_cv->get_type_info().get_type(), kPOINT);
      CHECK_EQ(poly_cv->get_type_info().get_type(), kARRAY);
      auto rewritten_lhs = deep_copy_visitor.visit(point_cv.get());
      CHECK(rewritten_lhs);
      auto rewritten_rhs = deep_copy_visitor.visit(poly_cv.get());
      CHECK(rewritten_rhs);
      VLOG(1) << "Rewriting the " << func_name << " to use overlaps join with lhs as "
              << rewritten_lhs->toString() << " and rhs as " << rewritten_rhs->toString();
      overlaps_oper = makeExpr<Analyzer::BinOper>(
          kBOOLEAN, kOVERLAPS, kONE, rewritten_lhs, rewritten_rhs);
      needs_to_return_original_expr = true;
    } else if (OverlapsJoinSupportedFunction::is_poly_point_rewrite_target_func(
                   func_name)) {
      // rest of functions reaching here is poly and point geo join query
      // to use overlaps hash join in this case, poly column must have its rte == 1
      // lhs is the point col_var
      auto lhs = func_oper->getOwnArg(2);
      auto rewritten_lhs = deep_copy_visitor.visit(lhs.get());
      CHECK(rewritten_lhs);
      const auto& lhs_ti = rewritten_lhs->get_type_info();

      if (!lhs_ti.is_geometry() && !is_constructed_point(rewritten_lhs.get())) {
        // TODO(adb): If ST_Contains is passed geospatial literals instead of columns,
        // the function will be expanded during translation rather than during code
        // generation. While this scenario does not make sense for the overlaps join, we
        // need to detect and abort the overlaps rewrite. Adding a GeospatialConstant
        // dervied class to the Analyzer may prove to be a better way to handle geo
        // literals, but for now we ensure the LHS type is a geospatial type, which
        // would mean the function has not been expanded to the physical types, yet.
        LOG(INFO) << "Unable to rewrite " << func_name
                  << " to overlaps conjunction. LHS input type is neither a geospatial "
                     "column nor a constructed point"
                  << func_oper->toString();
        return boost::none;
      }

      // rhs is coordinates of the poly col
      auto rhs = func_oper->getOwnArg(1);
      auto rewritten_rhs = deep_copy_visitor.visit(rhs.get());
      CHECK(rewritten_rhs);

      if (has_invalid_join_col_order(lhs.get(), rhs.get()).first) {
        LOG(INFO) << "Unable to rewrite " << func_name
                  << " to overlaps conjunction. Cannot build hash table over LHS type. "
                     "Check join order."
                  << func_oper->toString();
        return boost::none;
      }

      VLOG(1) << "Rewriting " << func_name << " to use overlaps join with lhs as "
              << rewritten_lhs->toString() << " and rhs as " << rewritten_rhs->toString();

      overlaps_oper = makeExpr<Analyzer::BinOper>(
          kBOOLEAN, kOVERLAPS, kONE, rewritten_lhs, rewritten_rhs);
      if (func_name !=
          OverlapsJoinSupportedFunction::ST_APPROX_OVERLAPS_MULTIPOLYGON_POINT_sv) {
        needs_to_return_original_expr = true;
      }
    }
  } else if (rewrite_type == OverlapsJoinRewriteType::RANGE_JOIN) {
    auto bin_oper = dynamic_cast<Analyzer::BinOper*>(expr.get());
    CHECK(bin_oper);
    auto lhs = dynamic_cast<const Analyzer::GeoOperator*>(bin_oper->get_left_operand());
    CHECK(lhs);
    auto rhs = dynamic_cast<const Analyzer::Constant*>(bin_oper->get_right_operand());
    CHECK(rhs);
    func_name = lhs->getName();
    overlaps_oper =
        convert_to_range_join_oper(func_name, expr, bin_oper, lhs, rhs, executor);
    needs_to_return_original_expr = true;
  }
  const auto expr_str = !func_name.empty() ? func_name : expr->toString();
  if (overlaps_oper) {
    VLOG(1) << "Successfully converted " << expr_str << " to overlaps join";
    if (needs_to_return_original_expr) {
      return OverlapsJoinConjunction{{expr}, {overlaps_oper}};
    } else {
      return OverlapsJoinConjunction{{}, {overlaps_oper}};
    }
  }
  VLOG(1) << "Overlaps join not enabled for " << expr_str;
  return boost::none;
}

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bool self_join_not_covered_by_left_deep_tree	(	const Analyzer::ColumnVar *	lhs,
		const Analyzer::ColumnVar *	rhs,
		const int	max_rte_covered
	)

Definition at line 1177 of file ExpressionRewrite.cpp.

References Analyzer::ColumnVar::get_rte_idx(), and Analyzer::ColumnVar::get_table_id().

Referenced by BaselineJoinHashTable::codegenKey(), PerfectJoinHashTable::codegenMatchingSet(), and PerfectJoinHashTable::codegenSlot().

                                                                        {
  if (key_side->get_table_id() == val_side->get_table_id() &&
      key_side->get_rte_idx() == val_side->get_rte_idx() &&
      key_side->get_rte_idx() > max_rte_covered) {
    return true;
  }
  return false;
}

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std::list<std::shared_ptr<Analyzer::Expr> > strip_join_covered_filter_quals	(	const std::list< std::shared_ptr< Analyzer::Expr >> &	quals,
		const JoinQualsPerNestingLevel &	join_quals
	)

Definition at line 1119 of file ExpressionRewrite.cpp.

References g_strip_join_covered_quals, and ScalarExprVisitor< T >::visit().

Referenced by RelAlgExecutionUnit::createCountAllExecutionUnit().

                                                {
  if (!g_strip_join_covered_quals) {
    return quals;
  }

  if (join_quals.empty()) {
    return quals;
  }

  std::list<std::shared_ptr<Analyzer::Expr>> quals_to_return;

  JoinCoveredQualVisitor visitor(join_quals);
  for (const auto& qual : quals) {
    if (!visitor.visit(qual.get())) {
      // Not a covered qual, don't elide it from the filtered count
      quals_to_return.push_back(qual);
    }
  }

  return quals_to_return;
}

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