org.eigenbase.rel.rules
Class PushProjector.InputSpecialOpFinder

java.lang.Object
  org.eigenbase.rex.RexVisitorImpl<Void>
      org.eigenbase.rel.rules.PushProjector.InputSpecialOpFinder

All Implemented Interfaces:

RexVisitor<Void>

Enclosing class:

PushProjector

private class PushProjector.InputSpecialOpFinder
extends RexVisitorImpl<Void>

Visitor which builds a bitmap of the inputs used by an expressions, as well as locating expressions corresponding to special operators.

Field Summary

private BitSet	leftFields
private PushProjector.ExprCondition	preserveExprCondition
private List<RexNode>	preserveLeft
private List<RexNode>	preserveRight
private BitSet	rexRefs
private BitSet	rightFields

Fields inherited from class org.eigenbase.rex.RexVisitorImpl

deep

Constructor Summary

PushProjector.InputSpecialOpFinder(BitSet rexRefs, BitSet leftFields, BitSet rightFields, PushProjector.ExprCondition preserveExprCondition, List<RexNode> preserveLeft, List<RexNode> preserveRight)

Method Summary

private void	addExpr(List<RexNode> exprList, RexNode newExpr) Adds an expression to a list if the same expression isn't already in the list.
void	apply(RexNode[] exprs, RexNode expr) Applies this visitor to an array of expressions and an optional single expression.
private boolean	preserve(RexNode call)
Void	visitCall(RexCall call)
Void	visitInputRef(RexInputRef inputRef)

Methods inherited from class org.eigenbase.rex.RexVisitorImpl

visitArrayAnd, visitArrayOr, visitCorrelVariable, visitDynamicParam, visitFieldAccess, visitLiteral, visitLocalRef, visitOver, visitRangeRef

Methods inherited from class java.lang.Object

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

Field Detail

rexRefs

private final BitSet rexRefs

leftFields

private final BitSet leftFields

rightFields

private final BitSet rightFields

preserveExprCondition

private final PushProjector.ExprCondition preserveExprCondition

preserveLeft

private final List<RexNode> preserveLeft

preserveRight

private final List<RexNode> preserveRight

Constructor Detail

PushProjector.InputSpecialOpFinder

public PushProjector.InputSpecialOpFinder(BitSet rexRefs,
                                          BitSet leftFields,
                                          BitSet rightFields,
                                          PushProjector.ExprCondition preserveExprCondition,
                                          List<RexNode> preserveLeft,
                                          List<RexNode> preserveRight)

Method Detail

visitCall

public Void visitCall(RexCall call)

Specified by:

visitCall in interface RexVisitor<Void>

Overrides:

visitCall in class RexVisitorImpl<Void>

preserve

private boolean preserve(RexNode call)

visitInputRef

public Void visitInputRef(RexInputRef inputRef)

Specified by:

visitInputRef in interface RexVisitor<Void>

Overrides:

visitInputRef in class RexVisitorImpl<Void>

apply

public void apply(RexNode[] exprs,
                  RexNode expr)

Applies this visitor to an array of expressions and an optional single expression.

addExpr

private void addExpr(List<RexNode> exprList,
                     RexNode newExpr)

Adds an expression to a list if the same expression isn't already in the list. Expressions are identical if their digests are the same.

Parameters:

exprList - current list of expressions

newExpr - new expression to be added