anonymous_namespace{RelAlgDagBuilder.cpp}::RexInputBackpropagationVisitor Class Reference

Inheritance diagram for anonymous_namespace{RelAlgDagBuilder.cpp}::RexInputBackpropagationVisitor:

Collaboration diagram for anonymous_namespace{RelAlgDagBuilder.cpp}::RexInputBackpropagationVisitor:

Public Member Functions
	RexInputBackpropagationVisitor (RelProject *node)
Public Member Functions inherited from RexVisitorBase< std::unique_ptr< const RexScalar > >
virtual std::unique_ptr< const RexScalar >	visit (const RexScalar *rex_scalar) const

Protected Member Functions
RetType	visitInput (const RexInput *rex_input) const final
Protected Member Functions inherited from RexDeepCopyVisitor
RetType	visitInput (const RexInput *input) const override
RetType	visitLiteral (const RexLiteral *literal) const override
RetType	visitSubQuery (const RexSubQuery *subquery) const override
RetType	visitRef (const RexRef *ref) const override
RetType	visitOperator (const RexOperator *rex_operator) const override
RetType	visitWindowFunctionOperator (const RexWindowFunctionOperator *rex_window_function_operator) const
RetType	visitCase (const RexCase *rex_case) const override

Private Attributes
RelProject *	node_

Additional Inherited Members
Public Types inherited from RexDeepCopyVisitor
using	RowValues = std::vector< std::unique_ptr< const RexScalar >>
Static Public Member Functions inherited from RexDeepCopyVisitor
static std::vector< RowValues >	copy (std::vector< RowValues > const &rhs)
Protected Types inherited from RexDeepCopyVisitor
using	RetType = std::unique_ptr< const RexScalar >

Detailed Description

Propagate an input backwards in the RA tree. With the exception of joins, all inputs must be carried through the RA tree. This visitor takes as a parameter a source projection RA Node, then checks to see if any inputs do not reference the source RA node (which implies the inputs reference a node farther back in the tree). The input is then backported to the source projection node, and a new input is generated which references the input on the source RA node, thereby carrying the input through the intermediate query step.

Definition at line 1850 of file RelAlgDagBuilder.cpp.

Constructor & Destructor Documentation

anonymous_namespace{RelAlgDagBuilder.cpp}::RexInputBackpropagationVisitor::RexInputBackpropagationVisitor ( RelProject *  node )

inline

Definition at line 1852 of file RelAlgDagBuilder.cpp.

References CHECK.

: node_(node) { CHECK(node_); }

Member Function Documentation

RetType anonymous_namespace{RelAlgDagBuilder.cpp}::RexInputBackpropagationVisitor::visitInput ( const RexInput *  rex_input ) const

inlinefinalprotectedvirtual

Implements RexVisitorBase< std::unique_ptr< const RexScalar > >.

Definition at line 1855 of file RelAlgDagBuilder.cpp.

                                                            {
    if (rex_input->getSourceNode() != node_) {
      const auto cur_index = rex_input->getIndex();
      auto cur_source_node = rex_input->getSourceNode();
      std::string field_name = "";
      if (auto cur_project_node = dynamic_cast<const RelProject*>(cur_source_node)) {
        field_name = cur_project_node->getFieldName(cur_index);
      }
      node_->appendInput(field_name, rex_input->deepCopy());
      return std::make_unique<RexInput>(node_, node_->size() - 1);
    } else {
      return rex_input->deepCopy();
    }
  }

Member Data Documentation

RelProject* anonymous_namespace{RelAlgDagBuilder.cpp}::RexInputBackpropagationVisitor::node_

mutableprivate

Definition at line 1871 of file RelAlgDagBuilder.cpp.

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

• /home/jenkins-slave/workspace/core-os-doxygen/QueryEngine/RelAlgDagBuilder.cpp