Class anonymous_namespace{RelAlgDagBuilder.cpp}::RexInputBackpropagationVisitorΒΆ
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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.
Public Functions
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anonymous_namespace{RelAlgDagBuilder.cpp}::RexInputBackpropagationVisitor::RexInputBackpropagationVisitor(RelProject * node)
Protected Functions
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RetType anonymous_namespace{RelAlgDagBuilder.cpp}::RexInputBackpropagationVisitor::visitInput(const RexInput * rex_input) const
Private Members
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RelProject* anonymous_namespace{RelAlgDagBuilder.cpp}::RexInputBackpropagationVisitor::node_
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