org.eigenbase.rel.rules
Class PushProjector.RefAndExprConverter

java.lang.Object
  org.eigenbase.rex.RexShuttle
      org.eigenbase.relopt.RelOptUtil.RexInputConverter
          org.eigenbase.rel.rules.PushProjector.RefAndExprConverter

All Implemented Interfaces:

RexVisitor<RexNode>

Enclosing class:

PushProjector

private class PushProjector.RefAndExprConverter
extends RelOptUtil.RexInputConverter

Walks an expression tree, replacing input refs with new values to reflect projection and converting special expressions to field references.

Field Summary

private int	firstLeftRef
private int	firstRightRef
private List<RexNode>	preserveLeft
private List<RexNode>	preserveRight

Fields inherited from class org.eigenbase.relopt.RelOptUtil.RexInputConverter

destFields, rexBuilder

Constructor Summary

PushProjector.RefAndExprConverter(RexBuilder rexBuilder, RelDataTypeField[] srcFields, RelDataTypeField[] destFields, int[] adjustments, List<RexNode> preserveLeft, int firstLeftRef, List<RexNode> preserveRight, int firstRightRef)

Method Summary

private int	findExprInList(RexNode rex, List<RexNode> rexList)
private int	findExprInLists(RexNode rex, List<RexNode> rexList1, int adjust1, List<RexNode> rexList2, int adjust2) Looks for a matching RexNode from among two lists of RexNodes and returns the offset into the list corresponding to the match, adjusted by an amount, depending on whether the match was from the first or second list.
RexNode	visitCall(RexCall call)

Methods inherited from class org.eigenbase.relopt.RelOptUtil.RexInputConverter

visitInputRef

Methods inherited from class org.eigenbase.rex.RexShuttle

apply, apply, visitArray, visitCorrelVariable, visitDynamicParam, visitFieldAccess, visitLiteral, visitLocalRef, visitOver, visitRangeRef, visitWindow

Methods inherited from class java.lang.Object

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

Field Detail

preserveLeft

private final List<RexNode> preserveLeft

firstLeftRef

private final int firstLeftRef

preserveRight

private final List<RexNode> preserveRight

firstRightRef

private final int firstRightRef

Constructor Detail

PushProjector.RefAndExprConverter

public PushProjector.RefAndExprConverter(RexBuilder rexBuilder,
                                         RelDataTypeField[] srcFields,
                                         RelDataTypeField[] destFields,
                                         int[] adjustments,
                                         List<RexNode> preserveLeft,
                                         int firstLeftRef,
                                         List<RexNode> preserveRight,
                                         int firstRightRef)

Method Detail

visitCall

public RexNode visitCall(RexCall call)

Specified by:

visitCall in interface RexVisitor<RexNode>

Overrides:

visitCall in class RexShuttle

findExprInLists

private int findExprInLists(RexNode rex,
                            List<RexNode> rexList1,
                            int adjust1,
                            List<RexNode> rexList2,
                            int adjust2)

Looks for a matching RexNode from among two lists of RexNodes and returns the offset into the list corresponding to the match, adjusted by an amount, depending on whether the match was from the first or second list.

Parameters:

rex - RexNode that is being matched against

rexList1 - first list of RexNodes

adjust1 - adjustment if match occurred in first list

rexList2 - second list of RexNodes

adjust2 - adjustment if match occurred in the second list

Returns:

index in the list corresponding to the matching RexNode; -1 if no match

findExprInList

private int findExprInList(RexNode rex,
                           List<RexNode> rexList)