Package com.apple.foundationdb.record.query.plan.plans

Class RecordQueryUnorderedUnionPlan

java.lang.Object

com.apple.foundationdb.record.query.plan.plans.RecordQueryUnionPlanBase

com.apple.foundationdb.record.query.plan.plans.RecordQueryUnorderedUnionPlan

All Implemented Interfaces:

PlanHashable, QueryPlan<FDBQueriedRecord<Message>>, RecordQueryPlan, RecordQueryPlanWithChildren, Bindable, Correlated<RelationalExpression>, PlannerGraphRewritable, RelationalExpressionWithChildren, RelationalExpression

@API(EXPERIMENTAL)
public class RecordQueryUnorderedUnionPlan
extends RecordQueryUnionPlanBase

A query plan that returns results from two-or-more cursors as they as ready. Unlike the RecordQueryUnionPlan, there are no ordering restrictions placed on the child plans (i.e., the children are free to return results in any order). However, this plan also makes no effort to remove duplicates from its children, and it also makes no guarantees as to what order it will return results.

Nested Class Summary

Nested classes/interfaces inherited from interface com.apple.foundationdb.record.query.plan.temp.Correlated

Correlated.BoundEquivalence

Nested classes/interfaces inherited from interface com.apple.foundationdb.record.PlanHashable

PlanHashable.PlanHashKind

Nested classes/interfaces inherited from interface com.apple.foundationdb.record.query.plan.temp.RelationalExpression

RelationalExpression.CombineFunction<R,S>, RelationalExpression.CombinePredicate

Field Summary

Fields inherited from class com.apple.foundationdb.record.query.plan.plans.RecordQueryUnionPlanBase

LOGGER, UNION

Fields inherited from interface com.apple.foundationdb.record.query.plan.plans.QueryPlan

UNKNOWN_MAX_CARDINALITY

Method Summary

Modifier and Type	Method	Description
static RecordQueryUnorderedUnionPlan	from(RecordQueryPlan left, RecordQueryPlan right)
static RecordQueryUnorderedUnionPlan	from(List<RecordQueryPlan> children)
Set<CorrelationIdentifier>	getCorrelatedToWithoutChildren()
int	planHash(PlanHashable.PlanHashKind hashKind)	Return a hash similar to hashCode, but with the additional guarantee that is is stable across JVMs.
RecordQueryUnorderedUnionPlan	rebaseWithRebasedQuantifiers(AliasMap translationMap, List<Quantifier> rebasedQuantifiers)
PlannerGraph	rewritePlannerGraph(List<? extends PlannerGraph> childGraphs)	Method to rewrite the planner graph.
String	toString()
RecordQueryUnorderedUnionPlan	withChildren(List<RecordQueryPlan> newChildren)

Methods inherited from class com.apple.foundationdb.record.query.plan.plans.RecordQueryUnionPlanBase

basePlanHash, equals, equalsWithoutChildren, execute, getAvailableFields, getChildren, getComplexity, getQuantifiers, getRelationalChildCount, hashCode, hashCodeWithoutChildren, isReverse, isStrictlySorted, logPlanStructure, strictlySorted

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.apple.foundationdb.record.PlanHashable

planHash

Methods inherited from interface com.apple.foundationdb.record.query.plan.plans.QueryPlan

execute, execute, maxCardinality

Methods inherited from interface com.apple.foundationdb.record.query.plan.plans.RecordQueryPlan

accept, execute, execute, execute, getQueryPlanChildren, structuralEquals, structuralEquals, structuralHashCode

Methods inherited from interface com.apple.foundationdb.record.query.plan.plans.RecordQueryPlanWithChildren

getUsedIndexes, hasFullRecordScan, hasIndexScan, hasLoadBykeys, hasRecordScan

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

Methods inherited from interface com.apple.foundationdb.record.query.plan.temp.expressions.RelationalExpressionWithChildren

getCorrelatedTo, rebase

Method Detail

toString

@Nonnull
public String toString()

Overrides:

toString in class RecordQueryUnionPlanBase

from

@Nonnull
public static RecordQueryUnorderedUnionPlan from(@Nonnull
                                                 List<RecordQueryPlan> children)

from

@Nonnull
public static RecordQueryUnorderedUnionPlan from(@Nonnull
                                                 RecordQueryPlan left,
                                                 @Nonnull
                                                 RecordQueryPlan right)

getCorrelatedToWithoutChildren

@Nonnull
public Set<CorrelationIdentifier> getCorrelatedToWithoutChildren()

rebaseWithRebasedQuantifiers

@Nonnull
public RecordQueryUnorderedUnionPlan rebaseWithRebasedQuantifiers(@Nonnull
                                                                  AliasMap translationMap,
                                                                  @Nonnull
                                                                  List<Quantifier> rebasedQuantifiers)

withChildren

@Nonnull
public RecordQueryUnorderedUnionPlan withChildren(@Nonnull
                                                  List<RecordQueryPlan> newChildren)

Specified by:

withChildren in class RecordQueryUnionPlanBase

rewritePlannerGraph

@Nonnull
public PlannerGraph rewritePlannerGraph(@Nonnull
                                        List<? extends PlannerGraph> childGraphs)

Description copied from interface: PlannerGraphRewritable

Method to rewrite the planner graph.

Parameters:

childGraphs - planner graphs of children expression that already have been computed

Returns:

a new planner graph that can combine the childGraphs in a meaningful way. Note that there is no obligation to use the childGraphs at all, this method can create a new independent planner graph completely from scratch.

planHash

public int planHash(@Nonnull
                    PlanHashable.PlanHashKind hashKind)

Description copied from interface: PlanHashable

Return a hash similar to hashCode, but with the additional guarantee that is is stable across JVMs.

Parameters:

hashKind - the "kind" of hash to calculate. Each kind of hash has a particular logic with regards to included and excluded items.

Returns:

a stable hash code