net.sf.farrago.query
Class FarragoReduceExpressionsRule.ReducibleExprLocator

java.lang.Object
  org.eigenbase.rex.RexVisitorImpl<Void>
      net.sf.farrago.query.FarragoReduceExpressionsRule.ReducibleExprLocator

All Implemented Interfaces:

RexVisitor<Void>

Enclosing class:

FarragoReduceExpressionsRule

private static class FarragoReduceExpressionsRule.ReducibleExprLocator
extends RexVisitorImpl<Void>

Helper class used to locate expressions that either can be reduced to literals or contain redundant casts.

Nested Class Summary

(package private) static class

FarragoReduceExpressionsRule.ReducibleExprLocator.Constancy

Field Summary

private List<Boolean>	addCasts
private List<RexNode>	constExprs
private List<SqlOperator>	parentCallTypeStack
private FarragoSessionPreparingStmt	preparingStmt
private List<RexNode>	removableCasts
private List<FarragoReduceExpressionsRule.ReducibleExprLocator.Constancy>	stack

Fields inherited from class org.eigenbase.rex.RexVisitorImpl

deep

Constructor Summary

FarragoReduceExpressionsRule.ReducibleExprLocator(FarragoSessionPreparingStmt preparingStmt, List<RexNode> constExprs, List<Boolean> addCasts, List<RexNode> removableCasts)

Method Summary

private void	addResult(RexNode exp)
void	analyze(RexNode exp)
private void	analyzeCall(RexCall call, FarragoReduceExpressionsRule.ReducibleExprLocator.Constancy callConstancy)
private Void	pushVariable()
private void	reduceCasts(RexCall outerCast)
Void	visitCall(RexCall call)
Void	visitCorrelVariable(RexCorrelVariable correlVariable)
Void	visitDynamicParam(RexDynamicParam dynamicParam)
Void	visitFieldAccess(RexFieldAccess fieldAccess)
Void	visitInputRef(RexInputRef inputRef)
Void	visitLiteral(RexLiteral literal)
Void	visitOver(RexOver over)
Void	visitRangeRef(RexRangeRef rangeRef)

Methods inherited from class org.eigenbase.rex.RexVisitorImpl

visitArrayAnd, visitArrayOr, visitLocalRef

Methods inherited from class java.lang.Object

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

Field Detail

preparingStmt

private final FarragoSessionPreparingStmt preparingStmt

stack

private final List<FarragoReduceExpressionsRule.ReducibleExprLocator.Constancy> stack

constExprs

private final List<RexNode> constExprs

addCasts

private final List<Boolean> addCasts

removableCasts

private final List<RexNode> removableCasts

parentCallTypeStack

private final List<SqlOperator> parentCallTypeStack

Constructor Detail

FarragoReduceExpressionsRule.ReducibleExprLocator

FarragoReduceExpressionsRule.ReducibleExprLocator(FarragoSessionPreparingStmt preparingStmt,
                                                  List<RexNode> constExprs,
                                                  List<Boolean> addCasts,
                                                  List<RexNode> removableCasts)

Method Detail

analyze

public void analyze(RexNode exp)

pushVariable

private Void pushVariable()

addResult

private void addResult(RexNode exp)

visitInputRef

public Void visitInputRef(RexInputRef inputRef)

Specified by:

visitInputRef in interface RexVisitor<Void>

Overrides:

visitInputRef in class RexVisitorImpl<Void>

visitLiteral

public Void visitLiteral(RexLiteral literal)

Specified by:

visitLiteral in interface RexVisitor<Void>

Overrides:

visitLiteral in class RexVisitorImpl<Void>

visitOver

public Void visitOver(RexOver over)

Specified by:

visitOver in interface RexVisitor<Void>

Overrides:

visitOver in class RexVisitorImpl<Void>

visitCorrelVariable

public Void visitCorrelVariable(RexCorrelVariable correlVariable)

Specified by:

visitCorrelVariable in interface RexVisitor<Void>

Overrides:

visitCorrelVariable in class RexVisitorImpl<Void>

visitCall

public Void visitCall(RexCall call)

Specified by:

visitCall in interface RexVisitor<Void>

Overrides:

visitCall in class RexVisitorImpl<Void>

analyzeCall

private void analyzeCall(RexCall call,
                         FarragoReduceExpressionsRule.ReducibleExprLocator.Constancy callConstancy)

reduceCasts

private void reduceCasts(RexCall outerCast)

visitDynamicParam

public Void visitDynamicParam(RexDynamicParam dynamicParam)

Specified by:

visitDynamicParam in interface RexVisitor<Void>

Overrides:

visitDynamicParam in class RexVisitorImpl<Void>

visitRangeRef

public Void visitRangeRef(RexRangeRef rangeRef)

Specified by:

visitRangeRef in interface RexVisitor<Void>

Overrides:

visitRangeRef in class RexVisitorImpl<Void>

visitFieldAccess

public Void visitFieldAccess(RexFieldAccess fieldAccess)

Specified by:

visitFieldAccess in interface RexVisitor<Void>

Overrides:

visitFieldAccess in class RexVisitorImpl<Void>