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>>	Handles caching-related tasks for a particular query type.
CacheStrategy.AddToResultFunction
DataSource	Represents a source...
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 details of a Query on a Segment
QueryRunnerFactoryConglomerate
QuerySegmentWalker	An interface for query-handling entry points.
QueryToolChestWarehouse
QueryWatcher	This interface is in a very early stage and should not be considered stable.

Class Summary

Class	Description
AbstractPrioritizedCallable<V>
BaseQuery<T>
BySegmentQueryRunner<T>	Query runner that wraps a base single-segment query runner, and wraps its results in a BySegmentResultValueClass object if the "bySegment" query context parameter is set.
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>
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.ScanQueryBuilder	A Builder for ScanQuery.
Druids.SearchQueryBuilder	A Builder for SearchQuery.
Druids.SegmentMetadataQueryBuilder	A Builder for SegmentMetadataQuery.
Druids.TimeBoundaryQueryBuilder	A Builder for TimeBoundaryQuery.
Druids.TimeseriesQueryBuilder	A Builder for TimeseriesQuery.
ExecutorServiceMonitor
FinalizeResultsQueryRunner<T>	Query runner that applies QueryToolChest.makePostComputeManipulatorFn(Query, MetricManipulationFn) to the result stream.
FluentQueryRunnerBuilder<T>
GlobalTableDataSource	TableDataSource variant for globally available 'broadcast' segments.
GroupByMergedQueryRunner<T>
InlineDataSource	Represents an inline datasource, where the rows are embedded within the DataSource object itself.
JoinDataSource	Represents a join of two datasources.
LookupDataSource	Represents a lookup.
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
QueryConfig	A user configuration holder for all query types.
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>
ReflectionQueryToolChestWarehouse	Deprecated
ReportTimelineMissingSegmentQueryRunner<T>
Result<T>
ResultGranularTimestampComparator<T>
ResultMergeQueryRunner<T>
SinkQueryRunners<T>
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>

Enum Summary

Enum	Description
QueryContexts.Vectorize

Exception Summary

Exception	Description
InsufficientResourcesException	This exception is thrown when the requested operation cannot be completed due to a lack of available resources.
QueryException	Base serializable error response QueryResource and SqlResource are expected to emit the JSON form of this object when errors happen.
QueryInterruptedException	Exception representing a failed query.
QueryUnsupportedException	This exception is for the query engine to surface when a query cannot be run.
ResourceLimitExceededException	Exception indicating that an operation failed because it exceeded some configured resource limit.
TruncatedResponseContextException	This exception is thrown when ResponseContext is truncated after serialization in historicals or realtime tasks.