@EverythingIsNonnullByDefault

Package org.apache.druid.query.groupby.epinephelinae

Interface Summary

Interface	Description
ByteBufferHashTable.BucketUpdateHandler
GroupByRowProcessor.ResultSupplier
Grouper<KeyType>	Groupers aggregate metrics from rows that they typically get from a ColumnSelectorFactory, under grouping keys that some outside driver is passing in.
Grouper.BufferComparator
Grouper.Entry<T>
Grouper.KeySerde<T>	Possibly-stateful object responsible for serde and comparison of keys.
Grouper.KeySerdeFactory<T>
IntGrouper	Grouper specialized for the primitive int type
IntGrouper.IntGrouperHashFunction
VectorGrouper	Like a Grouper, but vectorized.

Class Summary

Class	Description
AbstractBufferHashGrouper<KeyType>
AggregateResult
BufferArrayGrouper	A buffer grouper for array-based aggregation.
BufferHashGrouper<KeyType>
ByteBufferHashTable
ByteBufferIntList
ByteBufferMinMaxOffsetHeap	ByteBuffer-based implementation of the min-max heap developed by Atkinson, et al.
CloseableGrouperIterator<KeyType,T>
ConcurrentGrouper<KeyType>	Grouper based around a set of underlying SpillingGrouper instances.
DictionaryBuildingUtils	Utilities for parts of the groupBy engine that need to build dictionaries.
GroupByColumnSelectorStrategyFactory	Creates ColumnSelectorStrategys for grouping dimensions If the type is STRING, then it delegates the group by handling to KeyMappingMultiValueGroupByColumnSelectorStrategy which is specialized for DimensionSelectors and multi-value dimensions.
GroupByMergingQueryRunner	Class that knows how to merge a collection of groupBy QueryRunner objects, called queryables, using a buffer provided by mergeBufferPool and a parallel executor provided by exec.
GroupByQueryEngine	Contains logic to process a groupBy query on a single StorageAdapter in a non-vectorized manner.
GroupByResultMergeFn	Class that knows how to merge aggregator data from two groupBy ResultRow objects that have the same time and dimensions.
GroupByRowProcessor	Utility class that knows how to do higher-level groupBys: i.e.
GrouperBufferComparatorUtils	Set of utility methods to faciliate implementation of Grouper.KeySerde.bufferComparator() and Grouper.KeySerde.bufferComparatorWithAggregators(AggregatorFactory[], int[])
Groupers
HashVectorGrouper	An implementation of VectorGrouper backed by a growable MemoryOpenHashTable.
IntKey
LimitedBufferHashGrouper<KeyType>
LimitedBufferHashGrouper.BufferGrouperOffsetHeapIndexUpdater
LimitedTemporaryStorage	An area for limited temporary storage on disk.
ParallelCombiner<KeyType>	ParallelCombiner builds a combining tree which asynchronously aggregates input entries.
ReusableEntry<KeyType>	A Grouper.Entry implementation that is reusable.
RowBasedGrouperHelper	This class contains shared code between GroupByMergingQueryRunner and GroupByRowProcessor.
RowBasedGrouperHelper.RowBasedKey
SpillingGrouper<KeyType>	Grouper based around a single underlying BufferHashGrouper.
StreamingMergeSortedGrouper<KeyType>	A streaming grouper which can aggregate sorted inputs.

Exception Summary

Exception	Description
TemporaryStorageFullException
UnexpectedMultiValueDimensionException