Uses of Package
org.apache.druid.segment

Packages that use org.apache.druid.segment

Package	Description
org.apache.druid.query
org.apache.druid.query.aggregation
org.apache.druid.query.aggregation.any
org.apache.druid.query.aggregation.cardinality
org.apache.druid.query.aggregation.cardinality.types
org.apache.druid.query.aggregation.first
org.apache.druid.query.aggregation.hyperloglog
org.apache.druid.query.aggregation.last
org.apache.druid.query.aggregation.mean
org.apache.druid.query.datasourcemetadata
org.apache.druid.query.dimension
org.apache.druid.query.filter
org.apache.druid.query.filter.vector
org.apache.druid.query.groupby
org.apache.druid.query.groupby.epinephelinae
org.apache.druid.query.groupby.epinephelinae.column
org.apache.druid.query.groupby.epinephelinae.vector
org.apache.druid.query.groupby.strategy
org.apache.druid.query.lookup
org.apache.druid.query.metadata
org.apache.druid.query.scan
org.apache.druid.query.search
org.apache.druid.query.timeboundary
org.apache.druid.query.timeseries
org.apache.druid.query.topn
org.apache.druid.query.topn.types
org.apache.druid.query.vector
org.apache.druid.segment
org.apache.druid.segment.column
org.apache.druid.segment.data
org.apache.druid.segment.filter
org.apache.druid.segment.historical
org.apache.druid.segment.incremental
org.apache.druid.segment.join
org.apache.druid.segment.join.filter
org.apache.druid.segment.join.lookup
org.apache.druid.segment.join.table
org.apache.druid.segment.loading
org.apache.druid.segment.selector.settable
org.apache.druid.segment.serde
org.apache.druid.segment.vector
org.apache.druid.segment.virtual

Classes in org.apache.druid.segment used by org.apache.druid.query

Class and Description
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
Cursor Cursor is an interface for iteration over a range of data points, used during query execution.
RowAdapter An adapter between arbitrary types and the needs of callers that want to read specific columns out of those types (treating them as rows).
Segment The difference between this class and DataSegment is that DataSegment contains the segment metadata only, while this class represents the actual body of segment data, queryable.
SegmentReference A Segment with a associated references, such as ReferenceCountingSegment where the reference is the segment itself, and HashJoinSegment which wraps a ReferenceCountingSegment and also includes the associated list of JoinableClause
StorageAdapter
VirtualColumn Virtual columns are "views" created over a ColumnSelectorFactory or ColumnSelector.
VirtualColumns Class allowing lookup and usage of virtual columns.

Classes in org.apache.druid.segment used by org.apache.druid.query.aggregation

Class and Description
BaseDoubleColumnValueSelector Double value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseFloatColumnValueSelector Float value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseLongColumnValueSelector Long value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseNullableColumnValueSelector Null value checking polymorphic "part" of the ColumnValueSelector interface for primitive values.
BaseObjectColumnValueSelector Object value selecting polymorphic "part" of the ColumnValueSelector interface.
ColumnInspector
ColumnSelectorFactory Factory class for MetricSelectors
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
DoubleColumnSelector This interface is convenient for implementation of "double-sourcing" ColumnValueSelectors, it provides default implementations for all ColumnValueSelector's methods except BaseDoubleColumnValueSelector.getDouble().
GenericColumnSerializer GenericColumnSerializer can be implemented in custom aggregator extensions that would like to take full control of column serialization.
LongColumnSelector This interface is convenient for implementation of "long-sourcing" ColumnValueSelectors, it provides default implementations for all ColumnValueSelector's methods except BaseLongColumnValueSelector.getLong().
ObjectColumnSelector This class is convenient for implementation of "object-sourcing" ColumnValueSelectors, it provides default implementations for all ColumnValueSelector's methods except BaseObjectColumnValueSelector.getObject() and BaseObjectColumnValueSelector.classOfObject().

Classes in org.apache.druid.segment used by org.apache.druid.query.aggregation.any

Class and Description
BaseDoubleColumnValueSelector Double value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseFloatColumnValueSelector Float value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseLongColumnValueSelector Long value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseNullableColumnValueSelector Null value checking polymorphic "part" of the ColumnValueSelector interface for primitive values.
BaseObjectColumnValueSelector Object value selecting polymorphic "part" of the ColumnValueSelector interface.
ColumnSelectorFactory Factory class for MetricSelectors

Classes in org.apache.druid.segment used by org.apache.druid.query.aggregation.cardinality

Class and Description
BaseDoubleColumnValueSelector Double value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseFloatColumnValueSelector Float value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseLongColumnValueSelector Long value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseNullableColumnValueSelector Null value checking polymorphic "part" of the ColumnValueSelector interface for primitive values.
BaseObjectColumnValueSelector Object value selecting polymorphic "part" of the ColumnValueSelector interface.
ColumnSelectorFactory Factory class for MetricSelectors
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
ObjectColumnSelector This class is convenient for implementation of "object-sourcing" ColumnValueSelectors, it provides default implementations for all ColumnValueSelector's methods except BaseObjectColumnValueSelector.getObject() and BaseObjectColumnValueSelector.classOfObject().

Classes in org.apache.druid.segment used by org.apache.druid.query.aggregation.cardinality.types

Class and Description
BaseDoubleColumnValueSelector Double value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseFloatColumnValueSelector Float value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseLongColumnValueSelector Long value selecting polymorphic "part" of the ColumnValueSelector interface.
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
DimensionSelector Selector for a string-typed column, either single- or multi-valued.

Classes in org.apache.druid.segment used by org.apache.druid.query.aggregation.first

Class and Description
BaseDoubleColumnValueSelector Double value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseFloatColumnValueSelector Float value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseLongColumnValueSelector Long value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseNullableColumnValueSelector Null value checking polymorphic "part" of the ColumnValueSelector interface for primitive values.
BaseObjectColumnValueSelector Object value selecting polymorphic "part" of the ColumnValueSelector interface.
ColumnSelectorFactory Factory class for MetricSelectors
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
ObjectColumnSelector This class is convenient for implementation of "object-sourcing" ColumnValueSelectors, it provides default implementations for all ColumnValueSelector's methods except BaseObjectColumnValueSelector.getObject() and BaseObjectColumnValueSelector.classOfObject().

Classes in org.apache.druid.segment used by org.apache.druid.query.aggregation.hyperloglog

Class and Description
BaseObjectColumnValueSelector Object value selecting polymorphic "part" of the ColumnValueSelector interface.
ColumnInspector
ColumnSelectorFactory Factory class for MetricSelectors
GenericColumnSerializer GenericColumnSerializer can be implemented in custom aggregator extensions that would like to take full control of column serialization.

Classes in org.apache.druid.segment used by org.apache.druid.query.aggregation.last

Class and Description
BaseDoubleColumnValueSelector Double value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseFloatColumnValueSelector Float value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseLongColumnValueSelector Long value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseNullableColumnValueSelector Null value checking polymorphic "part" of the ColumnValueSelector interface for primitive values.
BaseObjectColumnValueSelector Object value selecting polymorphic "part" of the ColumnValueSelector interface.
ColumnSelectorFactory Factory class for MetricSelectors
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
ObjectColumnSelector This class is convenient for implementation of "object-sourcing" ColumnValueSelectors, it provides default implementations for all ColumnValueSelector's methods except BaseObjectColumnValueSelector.getObject() and BaseObjectColumnValueSelector.classOfObject().

Classes in org.apache.druid.segment used by org.apache.druid.query.aggregation.mean

Class and Description
ColumnInspector
ColumnSelectorFactory Factory class for MetricSelectors
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.

Classes in org.apache.druid.segment used by org.apache.druid.query.datasourcemetadata

Class and Description
Segment The difference between this class and DataSegment is that DataSegment contains the segment metadata only, while this class represents the actual body of segment data, queryable.

Classes in org.apache.druid.segment used by org.apache.druid.query.dimension

Class and Description
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
DimensionSelector Selector for a string-typed column, either single- or multi-valued.

Classes in org.apache.druid.segment used by org.apache.druid.query.filter

Class and Description
ColumnSelector
ColumnSelectorFactory Factory class for MetricSelectors

Classes in org.apache.druid.segment used by org.apache.druid.query.filter.vector

Class and Description
VectorColumnProcessorFactory Class that encapsulates knowledge about how to create vector column processors.

Classes in org.apache.druid.segment used by org.apache.druid.query.groupby

Class and Description
Segment The difference between this class and DataSegment is that DataSegment contains the segment metadata only, while this class represents the actual body of segment data, queryable.
StorageAdapter
VirtualColumn Virtual columns are "views" created over a ColumnSelectorFactory or ColumnSelector.
VirtualColumns Class allowing lookup and usage of virtual columns.

Classes in org.apache.druid.segment used by org.apache.druid.query.groupby.epinephelinae

Class and Description
ColumnSelectorFactory Factory class for MetricSelectors
StorageAdapter

Classes in org.apache.druid.segment used by org.apache.druid.query.groupby.epinephelinae.column

Class and Description
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.

Classes in org.apache.druid.segment used by org.apache.druid.query.groupby.epinephelinae.vector

Class and Description
StorageAdapter
VectorColumnProcessorFactory Class that encapsulates knowledge about how to create vector column processors.

Classes in org.apache.druid.segment used by org.apache.druid.query.groupby.strategy

Class and Description
StorageAdapter

Classes in org.apache.druid.segment used by org.apache.druid.query.lookup

Class and Description
RowBasedSegment A Segment that is based on a stream of objects.
Segment The difference between this class and DataSegment is that DataSegment contains the segment metadata only, while this class represents the actual body of segment data, queryable.

Classes in org.apache.druid.segment used by org.apache.druid.query.metadata

Class and Description
Segment The difference between this class and DataSegment is that DataSegment contains the segment metadata only, while this class represents the actual body of segment data, queryable.

Classes in org.apache.druid.segment used by org.apache.druid.query.scan

Class and Description
Segment The difference between this class and DataSegment is that DataSegment contains the segment metadata only, while this class represents the actual body of segment data, queryable.
VirtualColumns Class allowing lookup and usage of virtual columns.

Classes in org.apache.druid.segment used by org.apache.druid.query.search

Class and Description
BaseDoubleColumnValueSelector Double value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseFloatColumnValueSelector Float value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseLongColumnValueSelector Long value selecting polymorphic "part" of the ColumnValueSelector interface.
DimensionSelector Selector for a string-typed column, either single- or multi-valued.
QueryableIndex Direct interface to memory mapped segments.
Segment The difference between this class and DataSegment is that DataSegment contains the segment metadata only, while this class represents the actual body of segment data, queryable.

Classes in org.apache.druid.segment used by org.apache.druid.query.timeboundary

Class and Description
Segment The difference between this class and DataSegment is that DataSegment contains the segment metadata only, while this class represents the actual body of segment data, queryable.

Classes in org.apache.druid.segment used by org.apache.druid.query.timeseries

Class and Description
Segment The difference between this class and DataSegment is that DataSegment contains the segment metadata only, while this class represents the actual body of segment data, queryable.
StorageAdapter
VirtualColumns Class allowing lookup and usage of virtual columns.

Classes in org.apache.druid.segment used by org.apache.druid.query.topn

Class and Description
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
Cursor Cursor is an interface for iteration over a range of data points, used during query execution.
DimensionSelector Selector for a string-typed column, either single- or multi-valued.
Segment The difference between this class and DataSegment is that DataSegment contains the segment metadata only, while this class represents the actual body of segment data, queryable.
StorageAdapter
VirtualColumn Virtual columns are "views" created over a ColumnSelectorFactory or ColumnSelector.
VirtualColumns Class allowing lookup and usage of virtual columns.

Classes in org.apache.druid.segment used by org.apache.druid.query.topn.types

Class and Description
BaseNullableColumnValueSelector Null value checking polymorphic "part" of the ColumnValueSelector interface for primitive values.
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
Cursor Cursor is an interface for iteration over a range of data points, used during query execution.
DimensionSelector Selector for a string-typed column, either single- or multi-valued.
StorageAdapter

Classes in org.apache.druid.segment used by org.apache.druid.query.vector

Class and Description
StorageAdapter

Classes in org.apache.druid.segment used by org.apache.druid.segment

Class and Description
AbstractIndex
BaseDoubleColumnValueSelector Double value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseFloatColumnValueSelector Float value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseLongColumnValueSelector Long value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseNullableColumnValueSelector Null value checking polymorphic "part" of the ColumnValueSelector interface for primitive values.
BaseObjectColumnValueSelector Object value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseSingleValueDimensionSelector
BitmapOffset
ColumnInspector
ColumnProcessorFactory Class that encapsulates knowledge about how to create "column processors", which are...
ColumnSelector
ColumnSelectorBitmapIndexSelector
ColumnSelectorFactory Factory class for MetricSelectors
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
Cursor Cursor is an interface for iteration over a range of data points, used during query execution.
CursorFactory Interface extended by StorageAdapter, which gives them the power to create cursors.
DimensionDictionarySelector Interface containing dictionary-related methods common to DimensionSelector, SingleValueDimensionVectorSelector, and MultiValueDimensionVectorSelector.
DimensionHandler Processing related interface A DimensionHandler is an object that encapsulates indexing, column merging/building, and querying operations for a given dimension type (e.g., dict-encoded String, Long).
DimensionIndexer Processing related interface A DimensionIndexer is a per-dimension stateful object that encapsulates type-specific operations and data structures used during the in-memory ingestion process (i.e., work done by IncrementalIndex).
DimensionMerger Processing related interface A DimensionMerger is a per-dimension stateful object that encapsulates type-specific operations and data structures used during the segment merging process (i.e., work done by IndexMerger).
DimensionMergerV9 Processing related interface DimensionMerger subclass to be used with IndexMergerV9.
DimensionSelector Selector for a string-typed column, either single- or multi-valued.
DoubleColumnSerializer
DoubleColumnSerializerV2 Column Serializer for double column.
FloatColumnSerializer
FloatColumnSerializerV2 Column Serializer for float column.
GenericColumnSerializer GenericColumnSerializer can be implemented in custom aggregator extensions that would like to take full control of column serialization.
IdLookup "Mixin" for DimensionSelector.
IndexableAdapter An adapter to an index
IndexIO
IndexMerger
IndexMerger.IndexSeeker
IndexSpec IndexSpec defines segment storage format options to be used at indexing time, such as bitmap type, and column compression formats.
LongColumnSerializer Unsafe for concurrent use from multiple threads.
LongColumnSerializerV2 Column Serializer for long column.
Metadata
MetricHolder
MetricHolder.MetricType
MMappedIndex
NilColumnValueSelector Represents "absent" column.
NumericDimensionMergerV9 Common base of LongDimensionMergerV9, DoubleDimensionMergerV9 and FloatDimensionMergerV9.
ProgressIndicator
QueryableIndex Direct interface to memory mapped segments.
QueryableIndexCursorSequenceBuilder.TimestampCheckingOffset
QueryableIndexIndexableAdapter
QueryableIndexStorageAdapter.FilterAnalysis
ReferenceCountedObject Interface for an object that may have a reference acquired in the form of a Closeable.
ReferenceCountingCloseableObject ReferenceCountingCloseableObject implements something like automatic reference count-based resource management, backed by a Phaser.
ReferenceCountingSegment Segment that is also a ReferenceCountingSegment, allowing query engines that operate directly on segments to track references so that dropping a Segment can be done safely to ensure there are no in-flight queries.
RowAdapter An adapter between arbitrary types and the needs of callers that want to read specific columns out of those types (treating them as rows).
RowBasedColumnSelectorFactory A ColumnSelectorFactory that is based on an object supplier and a RowAdapter for that type of object.
RowIterator Extension of TimeAndDimsIterator, specialized for RowPointer instead of TimeAndDimsPointer.
RowPointer Extension of TimeAndDimsPointer, that keeps "row number" of the current data point in some collection of data points, that actually makes this data point to be called "row", and the collection, thus, "collection of rows".
Segment The difference between this class and DataSegment is that DataSegment contains the segment metadata only, while this class represents the actual body of segment data, queryable.
SegmentReference A Segment with a associated references, such as ReferenceCountingSegment where the reference is the segment itself, and HashJoinSegment which wraps a ReferenceCountingSegment and also includes the associated list of JoinableClause
StorageAdapter
StringDimensionMergerV9.IndexSeeker
TimeAndDimsIterator TimeAndDimsIterator (in conjunction with TimeAndDimsPointer) is an Iterator-like abstraction, designed for allocation-free transformation, merging, combining and iteration over a stream of data points.
TimeAndDimsPointer TimeAndDimsPointer is used in conjunction with TimeAndDimsIterator, it's an _immutable_ object that points to different logical data points, as TimeAndDimsIterator.moveToNext() is called.
TransformableRowIterator TransformableRowIterator tightens RowIterator.getPointer() contract, that allows to transform iterated rows without allocations on each iterations, and reuse the mechanics of the underlying iterator.
VectorColumnProcessorFactory Class that encapsulates knowledge about how to create vector column processors.
VirtualColumn Virtual columns are "views" created over a ColumnSelectorFactory or ColumnSelector.
VirtualColumns Class allowing lookup and usage of virtual columns.

Classes in org.apache.druid.segment used by org.apache.druid.segment.column

Class and Description
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
DimensionSelector Selector for a string-typed column, either single- or multi-valued.

Classes in org.apache.druid.segment used by org.apache.druid.segment.data

Class and Description
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.

Classes in org.apache.druid.segment used by org.apache.druid.segment.filter

Class and Description
BaseDoubleColumnValueSelector Double value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseFloatColumnValueSelector Float value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseLongColumnValueSelector Long value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseObjectColumnValueSelector Object value selecting polymorphic "part" of the ColumnValueSelector interface.
ColumnProcessorFactory Class that encapsulates knowledge about how to create "column processors", which are...
ColumnSelector
ColumnSelectorFactory Factory class for MetricSelectors
DimensionDictionarySelector Interface containing dictionary-related methods common to DimensionSelector, SingleValueDimensionVectorSelector, and MultiValueDimensionVectorSelector.
DimensionSelector Selector for a string-typed column, either single- or multi-valued.

Classes in org.apache.druid.segment used by org.apache.druid.segment.historical

Class and Description
BaseDoubleColumnValueSelector Double value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseFloatColumnValueSelector Float value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseLongColumnValueSelector Long value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseNullableColumnValueSelector Null value checking polymorphic "part" of the ColumnValueSelector interface for primitive values.
BaseObjectColumnValueSelector Object value selecting polymorphic "part" of the ColumnValueSelector interface.
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
Cursor Cursor is an interface for iteration over a range of data points, used during query execution.
DimensionDictionarySelector Interface containing dictionary-related methods common to DimensionSelector, SingleValueDimensionVectorSelector, and MultiValueDimensionVectorSelector.
DimensionSelector Selector for a string-typed column, either single- or multi-valued.

Classes in org.apache.druid.segment used by org.apache.druid.segment.incremental

Class and Description
AbstractIndex
BaseDoubleColumnValueSelector Double value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseFloatColumnValueSelector Float value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseLongColumnValueSelector Long value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseNullableColumnValueSelector Null value checking polymorphic "part" of the ColumnValueSelector interface for primitive values.
BaseObjectColumnValueSelector Object value selecting polymorphic "part" of the ColumnValueSelector interface.
ColumnInspector
ColumnSelectorFactory Factory class for MetricSelectors
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
Cursor Cursor is an interface for iteration over a range of data points, used during query execution.
CursorFactory Interface extended by StorageAdapter, which gives them the power to create cursors.
DimensionHandler Processing related interface A DimensionHandler is an object that encapsulates indexing, column merging/building, and querying operations for a given dimension type (e.g., dict-encoded String, Long).
DimensionIndexer Processing related interface A DimensionIndexer is a per-dimension stateful object that encapsulates type-specific operations and data structures used during the in-memory ingestion process (i.e., work done by IncrementalIndex).
IndexableAdapter An adapter to an index
LongColumnSelector This interface is convenient for implementation of "long-sourcing" ColumnValueSelectors, it provides default implementations for all ColumnValueSelector's methods except BaseLongColumnValueSelector.getLong().
Metadata
StorageAdapter
TransformableRowIterator TransformableRowIterator tightens RowIterator.getPointer() contract, that allows to transform iterated rows without allocations on each iterations, and reuse the mechanics of the underlying iterator.
VirtualColumns Class allowing lookup and usage of virtual columns.

Classes in org.apache.druid.segment used by org.apache.druid.segment.join

Class and Description
AbstractDimensionSelector An abstract class that provides an implementation of AbstractDimensionSelector.getObject().
BaseDoubleColumnValueSelector Double value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseFloatColumnValueSelector Float value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseLongColumnValueSelector Long value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseNullableColumnValueSelector Null value checking polymorphic "part" of the ColumnValueSelector interface for primitive values.
BaseObjectColumnValueSelector Object value selecting polymorphic "part" of the ColumnValueSelector interface.
ColumnInspector
ColumnSelectorFactory Factory class for MetricSelectors
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
Cursor Cursor is an interface for iteration over a range of data points, used during query execution.
CursorFactory Interface extended by StorageAdapter, which gives them the power to create cursors.
DimensionDictionarySelector Interface containing dictionary-related methods common to DimensionSelector, SingleValueDimensionVectorSelector, and MultiValueDimensionVectorSelector.
DimensionSelector Selector for a string-typed column, either single- or multi-valued.
IdLookup "Mixin" for DimensionSelector.
Metadata
QueryableIndex Direct interface to memory mapped segments.
ReferenceCountedObject Interface for an object that may have a reference acquired in the form of a Closeable.
Segment The difference between this class and DataSegment is that DataSegment contains the segment metadata only, while this class represents the actual body of segment data, queryable.
SegmentReference A Segment with a associated references, such as ReferenceCountingSegment where the reference is the segment itself, and HashJoinSegment which wraps a ReferenceCountingSegment and also includes the associated list of JoinableClause
StorageAdapter
VirtualColumn Virtual columns are "views" created over a ColumnSelectorFactory or ColumnSelector.
VirtualColumns Class allowing lookup and usage of virtual columns.

Classes in org.apache.druid.segment used by org.apache.druid.segment.join.filter

Class and Description
ColumnInspector
ColumnSelectorFactory Factory class for MetricSelectors
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
DimensionSelector Selector for a string-typed column, either single- or multi-valued.
VirtualColumn Virtual columns are "views" created over a ColumnSelectorFactory or ColumnSelector.
VirtualColumns Class allowing lookup and usage of virtual columns.

Classes in org.apache.druid.segment used by org.apache.druid.segment.join.lookup

Class and Description
ColumnInspector
ColumnSelectorFactory Factory class for MetricSelectors
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
DimensionSelector Selector for a string-typed column, either single- or multi-valued.
ReferenceCountedObject Interface for an object that may have a reference acquired in the form of a Closeable.

Classes in org.apache.druid.segment used by org.apache.druid.segment.join.table

Class and Description
BaseDoubleColumnValueSelector Double value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseFloatColumnValueSelector Float value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseLongColumnValueSelector Long value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseNullableColumnValueSelector Null value checking polymorphic "part" of the ColumnValueSelector interface for primitive values.
BaseObjectColumnValueSelector Object value selecting polymorphic "part" of the ColumnValueSelector interface.
ColumnInspector
ColumnSelectorFactory Factory class for MetricSelectors
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
DimensionDictionarySelector Interface containing dictionary-related methods common to DimensionSelector, SingleValueDimensionVectorSelector, and MultiValueDimensionVectorSelector.
DimensionSelector Selector for a string-typed column, either single- or multi-valued.
IdLookup "Mixin" for DimensionSelector.
ReferenceCountedObject Interface for an object that may have a reference acquired in the form of a Closeable.
RowAdapter An adapter between arbitrary types and the needs of callers that want to read specific columns out of those types (treating them as rows).

Classes in org.apache.druid.segment used by org.apache.druid.segment.loading

Class and Description
IndexIO
Segment The difference between this class and DataSegment is that DataSegment contains the segment metadata only, while this class represents the actual body of segment data, queryable.

Classes in org.apache.druid.segment used by org.apache.druid.segment.selector.settable

Class and Description
BaseDoubleColumnValueSelector Double value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseFloatColumnValueSelector Float value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseLongColumnValueSelector Long value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseNullableColumnValueSelector Null value checking polymorphic "part" of the ColumnValueSelector interface for primitive values.
BaseObjectColumnValueSelector Object value selecting polymorphic "part" of the ColumnValueSelector interface.
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
DimensionDictionarySelector Interface containing dictionary-related methods common to DimensionSelector, SingleValueDimensionVectorSelector, and MultiValueDimensionVectorSelector.
DimensionSelector Selector for a string-typed column, either single- or multi-valued.
DoubleColumnSelector This interface is convenient for implementation of "double-sourcing" ColumnValueSelectors, it provides default implementations for all ColumnValueSelector's methods except BaseDoubleColumnValueSelector.getDouble().
FloatColumnSelector This interface is convenient for implementation of "float-sourcing" ColumnValueSelectors, it provides default implementations for all ColumnValueSelector's methods except BaseFloatColumnValueSelector.getFloat().
IdLookup "Mixin" for DimensionSelector.
LongColumnSelector This interface is convenient for implementation of "long-sourcing" ColumnValueSelectors, it provides default implementations for all ColumnValueSelector's methods except BaseLongColumnValueSelector.getLong().
ObjectColumnSelector This class is convenient for implementation of "object-sourcing" ColumnValueSelectors, it provides default implementations for all ColumnValueSelector's methods except BaseObjectColumnValueSelector.getObject() and BaseObjectColumnValueSelector.classOfObject().

Classes in org.apache.druid.segment used by org.apache.druid.segment.serde

Class and Description
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
GenericColumnSerializer GenericColumnSerializer can be implemented in custom aggregator extensions that would like to take full control of column serialization.

Classes in org.apache.druid.segment used by org.apache.druid.segment.vector

Class and Description
ColumnInspector
DimensionDictionarySelector Interface containing dictionary-related methods common to DimensionSelector, SingleValueDimensionVectorSelector, and MultiValueDimensionVectorSelector.
IdLookup "Mixin" for DimensionSelector.
QueryableIndex Direct interface to memory mapped segments.

Classes in org.apache.druid.segment used by org.apache.druid.segment.virtual

Class and Description
BaseDoubleColumnValueSelector Double value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseFloatColumnValueSelector Float value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseLongColumnValueSelector Long value selecting polymorphic "part" of the ColumnValueSelector interface.
BaseNullableColumnValueSelector Null value checking polymorphic "part" of the ColumnValueSelector interface for primitive values.
BaseObjectColumnValueSelector Object value selecting polymorphic "part" of the ColumnValueSelector interface.
ColumnInspector
ColumnSelectorFactory Factory class for MetricSelectors
ColumnValueSelector Base type for interfaces that manage column value selection, e.g.
DimensionDictionarySelector Interface containing dictionary-related methods common to DimensionSelector, SingleValueDimensionVectorSelector, and MultiValueDimensionVectorSelector.
DimensionSelector Selector for a string-typed column, either single- or multi-valued.
IdLookup "Mixin" for DimensionSelector.
VirtualColumn Virtual columns are "views" created over a ColumnSelectorFactory or ColumnSelector.
VirtualColumns Class allowing lookup and usage of virtual columns.