Class LogicalDistinctExpression
- java.lang.Object
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- com.apple.foundationdb.record.query.plan.temp.expressions.LogicalDistinctExpression
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- All Implemented Interfaces:
Bindable
,Correlated<RelationalExpression>
,RelationalExpressionWithChildren
,RelationalExpression
@API(EXPERIMENTAL) public class LogicalDistinctExpression extends Object implements RelationalExpressionWithChildren
A relational planner expression representing a stream of unique records. This expression has a single child which is also aRelationalExpression
. This expression represents this underlying expression with its result set de-duplicated.- See Also:
for the fallback implementation
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Nested Class Summary
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Nested classes/interfaces inherited from interface com.apple.foundationdb.record.query.plan.temp.Correlated
Correlated.BoundEquivalence
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Nested classes/interfaces inherited from interface com.apple.foundationdb.record.query.plan.temp.RelationalExpression
RelationalExpression.CombineFunction<R,S>, RelationalExpression.CombinePredicate
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Constructor Summary
Constructors Constructor Description LogicalDistinctExpression(ExpressionRef<RelationalExpression> innerRef)
LogicalDistinctExpression(Quantifier inner)
LogicalDistinctExpression(RelationalExpression inner)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
equals(Object other)
boolean
equalsWithoutChildren(RelationalExpression otherExpression, AliasMap equivalences)
Set<CorrelationIdentifier>
getCorrelatedToWithoutChildren()
List<? extends Quantifier>
getQuantifiers()
Return an iterator of references to the children of this planner expression.int
getRelationalChildCount()
int
hashCode()
int
hashCodeWithoutChildren()
LogicalDistinctExpression
rebase(AliasMap translationMap)
Rebases this and all other objects this objects is composed of using a given translation map.LogicalDistinctExpression
rebaseWithRebasedQuantifiers(AliasMap translationMap, List<Quantifier> rebasedChildren)
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Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface com.apple.foundationdb.record.query.plan.temp.RelationalExpression
acceptPropertyVisitor, adjustMatch, bindIdentities, bindTo, canCorrelate, compensate, enumerateUnboundCorrelatedTo, exactlySubsumedBy, findMatches, getResultValues, hasIncompatibleBoundQuantifiers, hasUnboundQuantifiers, match, match, semanticEquals, semanticEquals, semanticHashCode, show, subsumedBy
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Methods inherited from interface com.apple.foundationdb.record.query.plan.temp.expressions.RelationalExpressionWithChildren
getCorrelatedTo
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Constructor Detail
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LogicalDistinctExpression
public LogicalDistinctExpression(@Nonnull RelationalExpression inner)
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LogicalDistinctExpression
public LogicalDistinctExpression(@Nonnull ExpressionRef<RelationalExpression> innerRef)
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LogicalDistinctExpression
public LogicalDistinctExpression(@Nonnull Quantifier inner)
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Method Detail
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getRelationalChildCount
public int getRelationalChildCount()
- Specified by:
getRelationalChildCount
in interfaceRelationalExpressionWithChildren
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getQuantifiers
@Nonnull public List<? extends Quantifier> getQuantifiers()
Description copied from interface:RelationalExpression
Return an iterator of references to the children of this planner expression. The iterators returned by different calls are guaranteed to be independent (i.e., advancing one will not advance another). However, they might point to the same object, as whenCollections.emptyIterator()
is returned. The returned iterator should be treated as an immutable object and may throw an exception ifIterator.remove()
is called. The iterator must return its elements in a consistent order.- Specified by:
getQuantifiers
in interfaceRelationalExpression
- Returns:
- an iterator of references to the children of this planner expression
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getCorrelatedToWithoutChildren
@Nonnull public Set<CorrelationIdentifier> getCorrelatedToWithoutChildren()
- Specified by:
getCorrelatedToWithoutChildren
in interfaceRelationalExpressionWithChildren
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rebase
@Nonnull public LogicalDistinctExpression rebase(@Nonnull AliasMap translationMap)
Description copied from interface:Correlated
Rebases this and all other objects this objects is composed of using a given translation map.- Specified by:
rebase
in interfaceCorrelated<RelationalExpression>
- Specified by:
rebase
in interfaceRelationalExpressionWithChildren
- Parameters:
translationMap
- a map defining a translation fromCorrelationIdentifier
sids
toCorrelationIdentifier
sids'
. After the rebase, every correlation to anid
containedids
that is contained or referred to directly or indirectly bythis
must have been transformed to use the mapped counterpart ofid
id'
inids'
. IDs not contained in the translation map must remain unmodified by the rebase operation.- Returns:
- a new entity that has been rebased
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rebaseWithRebasedQuantifiers
@Nonnull public LogicalDistinctExpression rebaseWithRebasedQuantifiers(@Nonnull AliasMap translationMap, @Nonnull List<Quantifier> rebasedChildren)
- Specified by:
rebaseWithRebasedQuantifiers
in interfaceRelationalExpressionWithChildren
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equalsWithoutChildren
public boolean equalsWithoutChildren(@Nonnull RelationalExpression otherExpression, @Nonnull AliasMap equivalences)
- Specified by:
equalsWithoutChildren
in interfaceRelationalExpression
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hashCodeWithoutChildren
public int hashCodeWithoutChildren()
- Specified by:
hashCodeWithoutChildren
in interfaceRelationalExpression
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