Package org.apache.druid.query

Class LeafDataSource

java.lang.Object

org.apache.druid.query.LeafDataSource

All Implemented Interfaces:

Cacheable, DataSource

Direct Known Subclasses:

FrameBasedInlineDataSource, InlineDataSource, LookupDataSource, TableDataSource

public abstract class LeafDataSource
extends Object
implements DataSource

Leaf DataSource-s have no inputs.

Field Summary

Fields inherited from interface org.apache.druid.query.DataSource

JOIN_OPERATION_CACHE_ID, NOOP_CACHE_ID, TABLE_DATA_SOURCE_CACHE_ID

Constructor Summary

Constructors

Constructor	Description
LeafDataSource()

Method Summary

Modifier and Type	Method	Description
SegmentMapFunction	createSegmentMapFunction(Query query)	Returns a segment function on to how to segment should be modified.
final List<DataSource>	getChildren()	Returns datasources that this datasource depends on.
final DataSource	withChildren(List<DataSource> children)	Return a new DataSource, identical to this one, with different children.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.query.DataSource

createSegmentPruner, getCacheKey, getTableNames, isCacheable, isGlobal, isProcessable, withPolicies

Constructor Details

LeafDataSource

public LeafDataSource()

Method Details

getChildren

public final List<DataSource> getChildren()

Description copied from interface: DataSource

Returns datasources that this datasource depends on. Will be empty for leaf datasources like 'table'.

Specified by:

getChildren in interface DataSource

withChildren

public final DataSource withChildren(List<DataSource> children)

Description copied from interface: DataSource

Return a new DataSource, identical to this one, with different children. The number of children must be equal to the number of children that this datasource already has.

Specified by:

withChildren in interface DataSource

createSegmentMapFunction

public SegmentMapFunction createSegmentMapFunction(Query query)

Description copied from interface: DataSource

Returns a segment function on to how to segment should be modified.

Specified by:

createSegmentMapFunction in interface DataSource