org.apache.calcite.rel.rules

Class ReduceExpressionsRule.ReducibleExprLocator

java.lang.Object

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

org.apache.calcite.rel.rules.ReduceExpressionsRule.ReducibleExprLocator

All Implemented Interfaces:

RexVisitor<Void>

Enclosing class:

ReduceExpressionsRule

protected static class ReduceExpressionsRule.ReducibleExprLocator
extends RexVisitorImpl<Void>

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

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) static class	ReduceExpressionsRule.ReducibleExprLocator.Constancy Whether an expression is constant, and if so, whether it can be reduced to a simpler constant.

Field Summary

Fields

Modifier and Type	Field and Description
private List<Boolean>	addCasts
private com.google.common.collect.ImmutableMap<RexNode,RexNode>	constants
private List<RexNode>	constExprs
private Deque<SqlOperator>	parentCallTypeStack
private List<RexNode>	removableCasts
private List<ReduceExpressionsRule.ReducibleExprLocator.Constancy>	stack
private RelDataTypeFactory	typeFactory

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

deep

Constructor Summary

Constructors

Constructor and Description
ReducibleExprLocator(RelDataTypeFactory typeFactory, com.google.common.collect.ImmutableMap<RexNode,RexNode> constants, List<RexNode> constExprs, List<Boolean> addCasts, List<RexNode> removableCasts)

Method Summary

Modifier and Type	Method and Description
private void	addResult(RexNode exp)
void	analyze(RexNode exp)
private void	analyzeCall(RexCall call, ReduceExpressionsRule.ReducibleExprLocator.Constancy callConstancy)
private Boolean	isUdf(SqlOperator operator)
private Void	pushVariable()
private void	reduceCasts(RexCall outerCast)
Void	visitCall(RexCall call)
Void	visitCorrelVariable(RexCorrelVariable variable)
Void	visitDynamicParam(RexDynamicParam dynamicParam)
Void	visitFieldAccess(RexFieldAccess fieldAccess)
Void	visitInputRef(RexInputRef inputRef)
Void	visitLiteral(RexLiteral literal)
Void	visitOver(RexOver over)
Void	visitRangeRef(RexRangeRef rangeRef)
Void	visitSubQuery(RexSubQuery subQuery)

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

visitArrayAnd, visitArrayOr, visitLocalRef, visitPatternFieldRef, visitTableInputRef

Methods inherited from class java.lang.Object

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

Field Detail

typeFactory

private final RelDataTypeFactory typeFactory

stack

private final List<ReduceExpressionsRule.ReducibleExprLocator.Constancy> stack

constants

private final com.google.common.collect.ImmutableMap<RexNode,RexNode> constants

constExprs

private final List<RexNode> constExprs

addCasts

private final List<Boolean> addCasts

removableCasts

private final List<RexNode> removableCasts

parentCallTypeStack

private final Deque<SqlOperator> parentCallTypeStack

Constructor Detail

ReducibleExprLocator

ReducibleExprLocator(RelDataTypeFactory typeFactory,
                     com.google.common.collect.ImmutableMap<RexNode,RexNode> constants,
                     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)

isUdf

private Boolean isUdf(SqlOperator operator)

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 variable)

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>

visitSubQuery

public Void visitSubQuery(RexSubQuery subQuery)

Specified by:

visitSubQuery in interface RexVisitor<Void>

Overrides:

visitSubQuery in class RexVisitorImpl<Void>

analyzeCall

private void analyzeCall(RexCall call,
                         ReduceExpressionsRule.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>