RelLeftDeepInnerJoin.h File Reference

#include <memory>
#include <vector>

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Functions
std::shared_ptr< const RelAlgNode >	get_left_deep_join_root (const std::shared_ptr< RelAlgNode > &node)
void	create_left_deep_join (std::vector< std::shared_ptr< RelAlgNode >> &nodes)
void	rebind_inputs_from_left_deep_join (const RexScalar *rex, const RelLeftDeepInnerJoin *left_deep_join)

Function Documentation

void create_left_deep_join

(

std::vector< std::shared_ptr< RelAlgNode >> &

nodes

)

Definition at line 293 of file RelLeftDeepInnerJoin.cpp.

References CHECK_EQ, CHECK_GE, anonymous_namespace{RelLeftDeepInnerJoin.cpp}::create_left_deep_join(), rebind_inputs_from_left_deep_join(), and RelJoin::replaceInput().

                                                                        {
  std::list<std::shared_ptr<RelAlgNode>> new_nodes;
  for (auto& left_deep_join_candidate : nodes) {
    std::shared_ptr<RelLeftDeepInnerJoin> left_deep_join;
    std::shared_ptr<const RelAlgNode> old_root;
    std::tie(left_deep_join, old_root) = create_left_deep_join(left_deep_join_candidate);
    if (!left_deep_join) {
      continue;
    }
    CHECK_GE(left_deep_join->inputCount(), size_t(2));
    for (size_t nesting_level = 1; nesting_level <= left_deep_join->inputCount() - 1;
         ++nesting_level) {
      const auto outer_condition = left_deep_join->getOuterCondition(nesting_level);
      if (outer_condition) {
        rebind_inputs_from_left_deep_join(outer_condition, left_deep_join.get());
      }
    }
    rebind_inputs_from_left_deep_join(left_deep_join->getInnerCondition(),
                                      left_deep_join.get());
    for (auto& node : nodes) {
      if (node && node->hasInput(old_root.get())) {
        node->replaceInput(left_deep_join_candidate, left_deep_join);
        std::shared_ptr<const RelJoin> old_join;
        if (std::dynamic_pointer_cast<const RelJoin>(left_deep_join_candidate)) {
          old_join = std::static_pointer_cast<const RelJoin>(left_deep_join_candidate);
        } else {
          CHECK_EQ(size_t(1), left_deep_join_candidate->inputCount());
          old_join = std::dynamic_pointer_cast<const RelJoin>(
              left_deep_join_candidate->getAndOwnInput(0));
        }
        while (old_join) {
          node->replaceInput(old_join, left_deep_join);
          old_join =
              std::dynamic_pointer_cast<const RelJoin>(old_join->getAndOwnInput(0));
        }
      }
    }

    new_nodes.emplace_back(std::move(left_deep_join));
  }

  // insert the new left join nodes to the front of the owned RelAlgNode list.
  // This is done to ensure all created RelAlgNodes exist in this list for later
  // visitation, such as RelAlgDag::resetQueryExecutionState.
  nodes.insert(nodes.begin(), new_nodes.begin(), new_nodes.end());
}

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std::shared_ptr<const RelAlgNode> get_left_deep_join_root

(

const std::shared_ptr< RelAlgNode > &

node

)

Definition at line 264 of file RelLeftDeepInnerJoin.cpp.

References ANTI, RelAlgNode::getAndOwnInput(), INNER, join(), and SEMI.

Referenced by anonymous_namespace{RelLeftDeepInnerJoin.cpp}::create_left_deep_join(), and RelAlgDagBuilder::optimizeDag().

                                           {
  const auto left_deep_join_filter = dynamic_cast<const RelFilter*>(node.get());
  if (left_deep_join_filter) {
    const auto join = dynamic_cast<const RelJoin*>(left_deep_join_filter->getInput(0));
    if (!join) {
      return nullptr;
    }
    if (join->getJoinType() == JoinType::INNER || join->getJoinType() == JoinType::SEMI ||
        join->getJoinType() == JoinType::ANTI) {
      return node;
    }
  }
  if (!node || node->inputCount() != 1) {
    return nullptr;
  }
  const auto join = dynamic_cast<const RelJoin*>(node->getInput(0));
  if (!join) {
    return nullptr;
  }
  return node->getAndOwnInput(0);
}

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void rebind_inputs_from_left_deep_join	(	const RexScalar *	rex,
		const RelLeftDeepInnerJoin *	left_deep_join
	)

Definition at line 287 of file RelLeftDeepInnerJoin.cpp.

Referenced by create_left_deep_join(), and anonymous_namespace{RelAlgDag.cpp}::RexRebindInputsVisitor::visitInput().

                                                                                   {
  RebindRexInputsFromLeftDeepJoin rebind_rex_inputs_from_left_deep_join(left_deep_join);
  rebind_rex_inputs_from_left_deep_join.visit(rex);
}

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