Package org.apache.druid.query

Interface Summary

Interface	Description
BitmapResultFactory<T>	BitmapResultFactory is an abstraction that allows to record something along with preFilter bitmap construction, and emit this information as dimension(s) of query metrics.
BySegmentResultValue<T>
CacheStrategy<T,CacheType,QueryType extends Query<T>>
DataSource
ExecutorServiceMonitor.MetricEmitter
GenericQueryMetricsFactory	This factory is used for DI of custom QueryMetrics implementations for all query types, which don't (yet) need to emit custom dimensions and/or metrics, i.
PostProcessingOperator<T>
PrioritizedCallable<V>
PrioritizedRunnable
Query<T>
QueryMetrics<QueryType extends Query<?>>	Abstraction wrapping ServiceMetricEvent.Builder and allowing to control what metrics are actually emitted, what dimensions do they have, etc.
QueryRunner<T>
QueryRunnerFactory<T,QueryType extends Query<T>>	An interface that defines the nitty gritty implementation detauls of a Query on a Segment
QueryRunnerFactoryConglomerate
QuerySegmentWalker
QueryToolChestWarehouse
QueryWatcher	This interface is in a very early stage and should not be considered stable.

Class Summary

Class	Description
AbstractPrioritizedCallable<V>
AsyncQueryRunner<T>
BaseQuery<T extends Comparable<T>>
BySegmentQueryRunner<T>
BySegmentResultValueClass<T>
BySegmentSkippingQueryRunner<T>
ChainedExecutionQueryRunner<T>	A QueryRunner that combines a list of other QueryRunners and executes them in parallel on an executor.
ColumnSelectorPlus<ColumnSelectorStrategyClass extends ColumnSelectorStrategy>	A grouping of various related objects used during query processing for a single dimension, used for convenience.
ConcatQueryRunner<T>
CPUTimeMetricQueryRunner<T>
DataSourceUtil
DefaultBitmapResultFactory
DefaultGenericQueryMetricsFactory
DefaultQueryMetrics<QueryType extends Query<?>>	DefaultQueryMetrics is unsafe for use from multiple threads.
DefaultQueryRunnerFactoryConglomerate
DruidMetrics
DruidProcessingConfig
Druids
Druids.DataSourceMetadataQueryBuilder	A Builder for DataSourceMetadataQuery.
Druids.SearchQueryBuilder	A Builder for SearchQuery.
Druids.SegmentMetadataQueryBuilder	A Builder for SegmentMetadataQuery.
Druids.SelectQueryBuilder	A Builder for SelectQuery.
Druids.TimeBoundaryQueryBuilder	A Builder for TimeBoundaryQuery.
Druids.TimeseriesQueryBuilder	A Builder for TimeseriesQuery.
ExecutorServiceMonitor
FinalizeResultsQueryRunner<T>
FluentQueryRunnerBuilder<T>
GroupByMergedQueryRunner<T>
IntervalChunkingQueryRunner<T>
IntervalChunkingQueryRunnerDecorator
LegacyDataSource
MapQueryToolChestWarehouse
MetricsEmittingExecutorService
MetricsEmittingQueryRunner<T>
MetricValueExtractor
NoopQueryRunner<T>
PerSegmentOptimizingQueryRunner<T>	This runner optimizes queries made on a single segment, using per-segment information, before submitting the queries to the base runner.
PerSegmentQueryOptimizationContext	Holds information about a single segment that Query objects can use to optimize themselves when they are run on that single segment.
PrioritizedExecutorService
Queries
QueryContexts
QueryDataSource
QueryPlus<T>	An immutable composite object of Query + extra stuff needed in QueryRunners.
QueryRunnerHelper
QueryToolChest<ResultType,QueryType extends Query<ResultType>>	The broker-side (also used by server in some cases) API for a specific Query type.
ReferenceCountingSegmentQueryRunner<T>
ReflectionLoaderThingy<T>	Deprecated
ReflectionQueryToolChestWarehouse	Deprecated
ReportTimelineMissingSegmentQueryRunner<T>
Result<T>
ResultGranularTimestampComparator<T>
ResultMergeQueryRunner<T>
RetryQueryRunner<T>
RetryQueryRunnerConfig
SubqueryQueryRunner<T>	If there's a subquery, run it instead of the outer query
TableDataSource
TimewarpOperator<T>	TimewarpOperator is an example post-processing operator that maps current time to the latest period ending withing the specified data interval and truncates the query interval to discard data that would be mapped to the future.
UnionDataSource
UnionQueryRunner<T>

Exception Summary

Exception	Description
InsufficientResourcesException	This exception is thrown when the requested operation cannot be completed due to a lack of available resources.
QueryInterruptedException	Exception representing a failed query.
ResourceLimitExceededException	Exception indicating that an operation failed because it exceeded some configured resource limit.