org.apache.calcite.rel.metadata

Class RelMdUtil.CardOfProjExpr

java.lang.Object

org.apache.calcite.rex.RexVisitorImpl<Double>

org.apache.calcite.rel.metadata.RelMdUtil.CardOfProjExpr

All Implemented Interfaces:

RexVisitor<Double>

Enclosing class:

RelMdUtil

private static class RelMdUtil.CardOfProjExpr
extends RexVisitorImpl<Double>

Visitor that walks over a scalar expression and computes the cardinality of its result.

Field Summary

Fields

Modifier and Type	Field and Description
private RelMetadataQuery	mq
private Project	rel

Fields inherited from class org.apache.calcite.rex.RexVisitorImpl

deep

Constructor Summary

Constructors

Constructor and Description
CardOfProjExpr(RelMetadataQuery mq, Project rel)

Method Summary

Modifier and Type	Method and Description
Double	visitCall(RexCall call)
Double	visitInputRef(RexInputRef var)
Double	visitLiteral(RexLiteral literal)

Methods inherited from class org.apache.calcite.rex.RexVisitorImpl

visitArrayAnd, visitArrayOr, visitCorrelVariable, visitDynamicParam, visitFieldAccess, visitLocalRef, visitOver, visitPatternFieldRef, visitRangeRef, visitSubQuery, visitTableInputRef

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

mq

private final RelMetadataQuery mq

rel

private Project rel

Constructor Detail

CardOfProjExpr

CardOfProjExpr(RelMetadataQuery mq,
               Project rel)

Method Detail

visitInputRef

public Double visitInputRef(RexInputRef var)

Specified by:

visitInputRef in interface RexVisitor<Double>

Overrides:

visitInputRef in class RexVisitorImpl<Double>

visitLiteral

public Double visitLiteral(RexLiteral literal)

Specified by:

visitLiteral in interface RexVisitor<Double>

Overrides:

visitLiteral in class RexVisitorImpl<Double>

visitCall

public Double visitCall(RexCall call)

Specified by:

visitCall in interface RexVisitor<Double>

Overrides:

visitCall in class RexVisitorImpl<Double>