org.apache.druid.query.groupby.strategy

Class GroupByStrategyV1

java.lang.Object

org.apache.druid.query.groupby.strategy.GroupByStrategyV1

All Implemented Interfaces:

GroupByStrategy

public class GroupByStrategyV1
extends Object
implements GroupByStrategy

Constructor Summary

Constructors

Constructor and Description
GroupByStrategyV1(com.google.common.base.Supplier<GroupByQueryConfig> configSupplier, GroupByQueryEngine engine, QueryWatcher queryWatcher, NonBlockingPool<ByteBuffer> bufferPool)

Method Summary

Modifier and Type	Method and Description
Sequence<org.apache.druid.data.input.Row>	applyPostProcessing(Sequence<org.apache.druid.data.input.Row> results, GroupByQuery query)
QueryRunner<org.apache.druid.data.input.Row>	createIntervalChunkingRunner(IntervalChunkingQueryRunnerDecorator decorator, QueryRunner<org.apache.druid.data.input.Row> runner, GroupByQueryQueryToolChest toolChest) Decorate a runner with an interval chunking decorator.
boolean	doMergeResults(GroupByQuery query) Indicates if this query should undergo "mergeResults" or not.
boolean	isCacheable(boolean willMergeRunners) Indicates this strategy is cacheable or not.
Sequence<org.apache.druid.data.input.Row>	mergeResults(QueryRunner<org.apache.druid.data.input.Row> baseRunner, GroupByQuery query, Map<String,Object> responseContext)
QueryRunner<org.apache.druid.data.input.Row>	mergeRunners(com.google.common.util.concurrent.ListeningExecutorService exec, Iterable<QueryRunner<org.apache.druid.data.input.Row>> queryRunners)
GroupByQueryResource	prepareResource(GroupByQuery query, boolean willMergeRunners) Initializes resources required for a broker to process the given query.
Sequence<org.apache.druid.data.input.Row>	process(GroupByQuery query, StorageAdapter storageAdapter)
Sequence<org.apache.druid.data.input.Row>	processSubqueryResult(GroupByQuery subquery, GroupByQuery query, GroupByQueryResource resource, Sequence<org.apache.druid.data.input.Row> subqueryResult)
Sequence<org.apache.druid.data.input.Row>	processSubtotalsSpec(GroupByQuery query, GroupByQueryResource resource, Sequence<org.apache.druid.data.input.Row> queryResult)

Methods inherited from class java.lang.Object

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

Constructor Detail

GroupByStrategyV1

@Inject
public GroupByStrategyV1(com.google.common.base.Supplier<GroupByQueryConfig> configSupplier,
                                 GroupByQueryEngine engine,
                                 QueryWatcher queryWatcher,
                                 NonBlockingPool<ByteBuffer> bufferPool)

Method Detail

prepareResource

public GroupByQueryResource prepareResource(GroupByQuery query,
                                            boolean willMergeRunners)

Description copied from interface: GroupByStrategy

Initializes resources required for a broker to process the given query.

Specified by:

prepareResource in interface GroupByStrategy

Parameters:

query - a groupBy query to be processed

Returns:

broker resource

isCacheable

public boolean isCacheable(boolean willMergeRunners)

Description copied from interface: GroupByStrategy

Indicates this strategy is cacheable or not. The willMergeRunners parameter can be used for distinguishing the caller is a broker or a data node.

Specified by:

isCacheable in interface GroupByStrategy

Parameters:

willMergeRunners - indicates that QueryRunnerFactory.mergeRunners(ExecutorService, Iterable) will be called on the cached by-segment results

Returns:

true if this strategy is cacheable, otherwise false.

createIntervalChunkingRunner

public QueryRunner<org.apache.druid.data.input.Row> createIntervalChunkingRunner(IntervalChunkingQueryRunnerDecorator decorator,
                                                                                 QueryRunner<org.apache.druid.data.input.Row> runner,
                                                                                 GroupByQueryQueryToolChest toolChest)

Description copied from interface: GroupByStrategy

Decorate a runner with an interval chunking decorator.

Specified by:

createIntervalChunkingRunner in interface GroupByStrategy

doMergeResults

public boolean doMergeResults(GroupByQuery query)

Description copied from interface: GroupByStrategy

Indicates if this query should undergo "mergeResults" or not.

Specified by:

doMergeResults in interface GroupByStrategy

mergeResults

public Sequence<org.apache.druid.data.input.Row> mergeResults(QueryRunner<org.apache.druid.data.input.Row> baseRunner,
                                                              GroupByQuery query,
                                                              Map<String,Object> responseContext)

Specified by:

mergeResults in interface GroupByStrategy

applyPostProcessing

public Sequence<org.apache.druid.data.input.Row> applyPostProcessing(Sequence<org.apache.druid.data.input.Row> results,
                                                                     GroupByQuery query)

Specified by:

applyPostProcessing in interface GroupByStrategy

processSubqueryResult

public Sequence<org.apache.druid.data.input.Row> processSubqueryResult(GroupByQuery subquery,
                                                                       GroupByQuery query,
                                                                       GroupByQueryResource resource,
                                                                       Sequence<org.apache.druid.data.input.Row> subqueryResult)

Specified by:

processSubqueryResult in interface GroupByStrategy

processSubtotalsSpec

public Sequence<org.apache.druid.data.input.Row> processSubtotalsSpec(GroupByQuery query,
                                                                      GroupByQueryResource resource,
                                                                      Sequence<org.apache.druid.data.input.Row> queryResult)

Specified by:

processSubtotalsSpec in interface GroupByStrategy

mergeRunners

public QueryRunner<org.apache.druid.data.input.Row> mergeRunners(com.google.common.util.concurrent.ListeningExecutorService exec,
                                                                 Iterable<QueryRunner<org.apache.druid.data.input.Row>> queryRunners)

Specified by:

mergeRunners in interface GroupByStrategy

process

public Sequence<org.apache.druid.data.input.Row> process(GroupByQuery query,
                                                         StorageAdapter storageAdapter)

Specified by:

process in interface GroupByStrategy