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

Interface RecordQueryPlanWithChild

All Superinterfaces:

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

All Known Implementing Classes:

RecordQueryCoveringIndexPlan, RecordQueryFilterPlan, RecordQueryInJoinPlan, RecordQueryInParameterJoinPlan, RecordQueryInValuesJoinPlan, RecordQueryPredicateFilterPlan, RecordQueryScoreForRankPlan, RecordQueryTypeFilterPlan, RecordQueryUnorderedDistinctPlan, RecordQueryUnorderedPrimaryKeyDistinctPlan

@API(EXPERIMENTAL)
public interface RecordQueryPlanWithChild
extends RecordQueryPlanWithChildren

A query plan with a single child plan.

Method Summary

Modifier and Type	Method	Description
RecordQueryPlan	getChild()
default List<RecordQueryPlan>	getChildren()	Returns the (zero or more) RecordQueryPlan children of this plan.
default int	getRelationalChildCount()
default Set<String>	getUsedIndexes()	Returns a set of names of the indexes used by this plan (and its sub-plans).
default boolean	hasFullRecordScan()	Indicates whether this plan (or one of its components) must perform a scan over all records in the store directly rather than going through a secondary index.
default boolean	hasIndexScan(String indexName)	Indicates whether this plan scans the given index.
default boolean	hasLoadBykeys()	Indicates whether this plan (or one of its components) loads records by their primary key.
default boolean	hasRecordScan()	Indicates whether this plan (or one of its components) scans at least a subset of the record range directly rather than going through a secondary index.

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

planHash

Methods inherited from interface com.apple.foundationdb.record.query.plan.temp.explain.PlannerGraphRewritable

rewritePlannerGraph

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

execute, execute, getComplexity, isReverse, logPlanStructure

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

execute, execute, execute, execute, getQueryPlanChildren

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

acceptPropertyVisitor, bindTo, equalsWithoutChildren, getQuantifiers, show

Method Detail

getChildren

@Nonnull
default List<RecordQueryPlan> getChildren()

Description copied from interface: RecordQueryPlan

Returns the (zero or more) RecordQueryPlan children of this plan.

Warning: This part of the API is undergoing active development. At some point in the future, the return type of this method will change to allow it to return a list of generic QueryPlans. At current, every RecordQueryPlan can only have other RecordQueryPlans as children. However, this is not guaranteed to be the case in the future. This method has been marked as API.Status.UNSTABLE as of version 2.5.

Specified by:

getChildren in interface RecordQueryPlan

Returns:

the child plans

getChild

RecordQueryPlan getChild()

getRelationalChildCount

default int getRelationalChildCount()

Specified by:

getRelationalChildCount in interface RelationalExpressionWithChildren

hasRecordScan

default boolean hasRecordScan()

Description copied from interface: QueryPlan

Indicates whether this plan (or one of its components) scans at least a subset of the record range directly rather than going through a secondary index. A plan may only scan over a subset of all records. Someone might not use any secondary indexes explicitly, but they might make use of the primary key index. For example, if they had a compound primary key, and they issued a query for all records that had some value for the first element of their primary key, the planner will produce a plan which scans over a subset of all records.

Specified by:

hasRecordScan in interface QueryPlan<FDBQueriedRecord<Message>>

Specified by:

hasRecordScan in interface RecordQueryPlanWithChildren

Returns:

true if this plan (or one of its components) scans at least a subset of the records directly

hasFullRecordScan

default boolean hasFullRecordScan()

Description copied from interface: QueryPlan

Indicates whether this plan (or one of its components) must perform a scan over all records in the store directly rather than going through a secondary index. See hasRecordScan for the comparison between two methods.

Specified by:

hasFullRecordScan in interface QueryPlan<FDBQueriedRecord<Message>>

Specified by:

hasFullRecordScan in interface RecordQueryPlanWithChildren

Returns:

true if this plan (or one of its components) must perform a scan over all records in the store directly

hasIndexScan

default boolean hasIndexScan(@Nonnull
                             String indexName)

Description copied from interface: QueryPlan

Indicates whether this plan scans the given index.

Specified by:

hasIndexScan in interface QueryPlan<FDBQueriedRecord<Message>>

Specified by:

hasIndexScan in interface RecordQueryPlanWithChildren

Parameters:

indexName - the name of the index to check for

Returns:

true if this plan (or one of its children) scans the given index

getUsedIndexes

@Nonnull
default Set<String> getUsedIndexes()

Description copied from interface: QueryPlan

Returns a set of names of the indexes used by this plan (and its sub-plans).

Specified by:

getUsedIndexes in interface QueryPlan<FDBQueriedRecord<Message>>

Specified by:

getUsedIndexes in interface RecordQueryPlanWithChildren

Returns:

an set of indexes used by this plan

hasLoadBykeys

default boolean hasLoadBykeys()

Description copied from interface: QueryPlan

Indicates whether this plan (or one of its components) loads records by their primary key.

Specified by:

hasLoadBykeys in interface QueryPlan<FDBQueriedRecord<Message>>

Specified by:

hasLoadBykeys in interface RecordQueryPlanWithChildren

Returns:

true if this plan (or one of its components) loads records by their primary key