Package org.apache.druid.segment.join

Class FrameBasedInlineJoinableFactory

java.lang.Object

org.apache.druid.segment.join.FrameBasedInlineJoinableFactory

All Implemented Interfaces:

JoinableFactory

public class FrameBasedInlineJoinableFactory
extends Object
implements JoinableFactory

Creates a joinable from the FrameBasedInlineDataSource. This materializes the datasource to an InlineDataSource, before creating the joinable on it, which carries the overhead of this conversion.

Constructor Summary

Constructors

Constructor	Description
FrameBasedInlineJoinableFactory()

Method Summary

Modifier and Type	Method	Description
Optional<Joinable>	build(DataSource dataSource, JoinConditionAnalysis condition)	Create a Joinable object.
boolean	isDirectlyJoinable(DataSource dataSource)	Returns true if a Joinable **may** be created for a given DataSource, but is not a guarantee that JoinableFactory.build(org.apache.druid.query.DataSource, org.apache.druid.segment.join.JoinConditionAnalysis) will return a non-empty result.

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.segment.join.JoinableFactory

computeJoinCacheKey

Constructor Details

FrameBasedInlineJoinableFactory

public FrameBasedInlineJoinableFactory()

Method Details

isDirectlyJoinable

public boolean isDirectlyJoinable(DataSource dataSource)

Description copied from interface: JoinableFactory

Returns true if a Joinable **may** be created for a given DataSource, but is not a guarantee that JoinableFactory.build(org.apache.druid.query.DataSource, org.apache.druid.segment.join.JoinConditionAnalysis) will return a non-empty result. Successfully building a Joinable might require specific criteria of the JoinConditionAnalysis.

Specified by:

isDirectlyJoinable in interface JoinableFactory

build

public Optional<Joinable> build(DataSource dataSource,
 JoinConditionAnalysis condition)

Description copied from interface: JoinableFactory

Create a Joinable object. This may be an expensive operation involving loading data, creating a hash table, etc.

Specified by:

build in interface JoinableFactory

Parameters:

dataSource - the datasource to join on

condition - the condition to join on

Returns:

a Joinable if this datasource + condition combo is joinable; empty if not