org.teiid.query.sql.visitor

Class EvaluatableVisitor

java.lang.Object

org.teiid.query.sql.LanguageVisitor

org.teiid.query.sql.visitor.EvaluatableVisitor

public class EvaluatableVisitor
extends LanguageVisitor

This visitor class will traverse a language object tree, and determine if the current expression can be evaluated

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	EvaluatableVisitor.EvaluationLevel

Constructor Summary

Constructors

Constructor and Description
EvaluatableVisitor()
EvaluatableVisitor(Object modelId, QueryMetadataInterface metadata, CapabilitiesFinder capFinder)

Method Summary

Modifier and Type	Method and Description
void	evaluationNotPossible(EvaluatableVisitor.EvaluationLevel newLevel)
FunctionMethod.Determinism	getDeterminismLevel()
boolean	hasCorrelatedReferences()
static boolean	isEvaluatable(LanguageObject obj, EvaluatableVisitor.EvaluationLevel target)
static boolean	isFullyEvaluatable(LanguageObject obj, boolean duringPlanning) Should be called to check if the object can fully evaluated
static EvaluatableVisitor	needsEvaluationVisitor(Object modelID, QueryMetadataInterface metadata, CapabilitiesFinder capFinder)
static boolean	needsProcessingEvaluation(LanguageObject obj)
boolean	requiresEvaluation(EvaluatableVisitor.EvaluationLevel evaluationLevel)
void	reset()
void	setDeterminismLevel(FunctionMethod.Determinism value)
void	visit(AggregateSymbol obj)
void	visit(AliasSymbol obj)
void	visit(Constant obj)
void	visit(DependentSetCriteria obj)
void	visit(ElementSymbol obj)
void	visit(ExistsCriteria obj)
void	visit(ExpressionSymbol obj)
void	visit(Function obj)
void	visit(IsDistinctCriteria isDistinctCriteria)
void	visit(Reference obj) We assume the non-push down for correlation variables, then make specific checks when correlated variables are allowed.
void	visit(ScalarSubquery obj)
void	visit(StoredProcedure proc)
void	visit(SubqueryCompareCriteria obj)
void	visit(SubquerySetCriteria obj)
static boolean	willBecomeConstant(LanguageObject obj) Will return true if the expression can be deterministically evaluated at runtime, but it may not be evaluatable during planning
static boolean	willBecomeConstant(LanguageObject obj, boolean pushdown)

Methods inherited from class org.teiid.query.sql.LanguageVisitor

setAbort, shouldAbort, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Constructor Detail

EvaluatableVisitor

public EvaluatableVisitor()

EvaluatableVisitor

public EvaluatableVisitor(Object modelId,
                          QueryMetadataInterface metadata,
                          CapabilitiesFinder capFinder)

Method Detail

visit

public void visit(Function obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(Constant obj)

Overrides:

visit in class LanguageVisitor

setDeterminismLevel

public void setDeterminismLevel(FunctionMethod.Determinism value)

evaluationNotPossible

public void evaluationNotPossible(EvaluatableVisitor.EvaluationLevel newLevel)

visit

public void visit(ElementSymbol obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(ExpressionSymbol obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(AliasSymbol obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(AggregateSymbol obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(Reference obj)

We assume the non-push down for correlation variables, then make specific checks when correlated variables are allowed.

Overrides:

visit in class LanguageVisitor

visit

public void visit(StoredProcedure proc)

Overrides:

visit in class LanguageVisitor

visit

public void visit(ScalarSubquery obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(DependentSetCriteria obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(ExistsCriteria obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(SubquerySetCriteria obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(SubqueryCompareCriteria obj)

Overrides:

visit in class LanguageVisitor

visit

public void visit(IsDistinctCriteria isDistinctCriteria)

Overrides:

visit in class LanguageVisitor

willBecomeConstant

public static final boolean willBecomeConstant(LanguageObject obj)

Will return true if the expression can be deterministically evaluated at runtime, but it may not be evaluatable during planning

isFullyEvaluatable

public static final boolean isFullyEvaluatable(LanguageObject obj,
                                               boolean duringPlanning)

Should be called to check if the object can fully evaluated

isEvaluatable

public static final boolean isEvaluatable(LanguageObject obj,
                                          EvaluatableVisitor.EvaluationLevel target)

willBecomeConstant

public static final boolean willBecomeConstant(LanguageObject obj,
                                               boolean pushdown)

needsProcessingEvaluation

public static final boolean needsProcessingEvaluation(LanguageObject obj)

requiresEvaluation

public boolean requiresEvaluation(EvaluatableVisitor.EvaluationLevel evaluationLevel)

getDeterminismLevel

public FunctionMethod.Determinism getDeterminismLevel()

hasCorrelatedReferences

public boolean hasCorrelatedReferences()

needsEvaluationVisitor

public static final EvaluatableVisitor needsEvaluationVisitor(Object modelID,
                                                              QueryMetadataInterface metadata,
                                                              CapabilitiesFinder capFinder)

reset

public void reset()