Package com.apple.foundationdb.record.provider.foundationdb

Class IndexAggregateGroupKeys.IndexScan

java.lang.Object

com.apple.foundationdb.record.provider.foundationdb.IndexAggregateGroupKeys

com.apple.foundationdb.record.provider.foundationdb.IndexAggregateGroupKeys.IndexScan

Enclosing class:

IndexAggregateGroupKeys

@API(EXPERIMENTAL)
protected static class IndexAggregateGroupKeys.IndexScan
extends IndexAggregateGroupKeys

Nested Class Summary

Nested classes/interfaces inherited from class com.apple.foundationdb.record.provider.foundationdb.IndexAggregateGroupKeys

IndexAggregateGroupKeys.Conditions, IndexAggregateGroupKeys.IndexScan

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	IndexScan(String recordKey, int prefixSize)

Method Summary

Modifier and Type	Method	Description
int	getColumnSize()	Get the size of the prefix of the index aggregate that is returned.
Key.Evaluated	getGroupKeys(FDBRecordStoreBase<?> store, EvaluationContext context)	Get the grouping key (GROUP BY) for the index aggregate from the given context.

Methods inherited from class com.apple.foundationdb.record.provider.foundationdb.IndexAggregateGroupKeys

conditionsToGroupKeys, conditionsToGroupKeys, indexScanToGroupKeys

Methods inherited from class java.lang.Object

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

Constructor Detail

IndexScan

protected IndexScan(@Nonnull
                    String recordKey,
                    int prefixSize)

Method Detail

getGroupKeys

@Nonnull
public Key.Evaluated getGroupKeys(@Nullable
                                  FDBRecordStoreBase<?> store,
                                  @Nullable
                                  EvaluationContext context)

Description copied from class: IndexAggregateGroupKeys

Get the grouping key (GROUP BY) for the index aggregate from the given context.

Specified by:

getGroupKeys in class IndexAggregateGroupKeys

Parameters:

store - the record store for the query

context - context in which to evaluate keys

Returns:

the grouping key

getColumnSize

public int getColumnSize()

Description copied from class: IndexAggregateGroupKeys

Get the size of the prefix of the index aggregate that is returned. That is, the size of {#link #getGroupKeys}.

Specified by:

getColumnSize in class IndexAggregateGroupKeys

Returns:

number of items in the grouping key