org.eigenbase.rex
Class RexUtil.ExpressionNormalizer

java.lang.Object
  org.eigenbase.rex.RexVisitorImpl<RexNode>
      org.eigenbase.rex.RexUtil.ExpressionNormalizer

All Implemented Interfaces:

RexVisitor<RexNode>

Enclosing class:

RexUtil

private static class RexUtil.ExpressionNormalizer
extends RexVisitorImpl<RexNode>

Walks over expressions and builds a bank of common sub-expressions.

Nested Class Summary

private static class

RexUtil.ExpressionNormalizer.SubExprExistsException Thrown if there is a sub-expression.

Field Summary

(package private) boolean	allowDups
(package private) Map<String,RexNode>	mapDigestToExpr

Fields inherited from class org.eigenbase.rex.RexVisitorImpl

deep

Constructor Summary

protected

RexUtil.ExpressionNormalizer(boolean allowDups)

Method Summary

protected RexNode	lookup(RexNode expr)
protected RexNode	register(RexNode expr)
RexNode	visitCall(RexCall call)
RexNode	visitCorrelVariable(RexCorrelVariable correlVariable)
RexNode	visitDynamicParam(RexDynamicParam dynamicParam)
RexNode	visitFieldAccess(RexFieldAccess fieldAccess)
RexNode	visitInputRef(RexInputRef inputRef)
RexNode	visitLiteral(RexLiteral literal)
RexNode	visitRangeRef(RexRangeRef rangeRef)

Methods inherited from class org.eigenbase.rex.RexVisitorImpl

visitArrayAnd, visitArrayOr, visitLocalRef, visitOver

Methods inherited from class java.lang.Object

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

Field Detail

mapDigestToExpr

final Map<String,RexNode> mapDigestToExpr

allowDups

final boolean allowDups

Constructor Detail

RexUtil.ExpressionNormalizer

protected RexUtil.ExpressionNormalizer(boolean allowDups)

Method Detail

register

protected RexNode register(RexNode expr)

lookup

protected RexNode lookup(RexNode expr)

visitInputRef

public RexNode visitInputRef(RexInputRef inputRef)

Specified by:

visitInputRef in interface RexVisitor<RexNode>

Overrides:

visitInputRef in class RexVisitorImpl<RexNode>

visitLiteral

public RexNode visitLiteral(RexLiteral literal)

Specified by:

visitLiteral in interface RexVisitor<RexNode>

Overrides:

visitLiteral in class RexVisitorImpl<RexNode>

visitCorrelVariable

public RexNode visitCorrelVariable(RexCorrelVariable correlVariable)

Specified by:

visitCorrelVariable in interface RexVisitor<RexNode>

Overrides:

visitCorrelVariable in class RexVisitorImpl<RexNode>

visitCall

public RexNode visitCall(RexCall call)

Specified by:

visitCall in interface RexVisitor<RexNode>

Overrides:

visitCall in class RexVisitorImpl<RexNode>

visitDynamicParam

public RexNode visitDynamicParam(RexDynamicParam dynamicParam)

Specified by:

visitDynamicParam in interface RexVisitor<RexNode>

Overrides:

visitDynamicParam in class RexVisitorImpl<RexNode>

visitRangeRef

public RexNode visitRangeRef(RexRangeRef rangeRef)

Specified by:

visitRangeRef in interface RexVisitor<RexNode>

Overrides:

visitRangeRef in class RexVisitorImpl<RexNode>

visitFieldAccess

public RexNode visitFieldAccess(RexFieldAccess fieldAccess)

Specified by:

visitFieldAccess in interface RexVisitor<RexNode>

Overrides:

visitFieldAccess in class RexVisitorImpl<RexNode>