org.apache.druid.segment.join

Class InlineJoinableFactory

java.lang.Object

org.apache.druid.segment.join.InlineJoinableFactory

All Implemented Interfaces:

JoinableFactory

public class InlineJoinableFactory
extends Object
implements JoinableFactory

A JoinableFactory for InlineDataSource. It works by building an IndexedTable. It is not valid to pass any other DataSource type to the "build" method.

Constructor Summary

Constructors

Constructor and Description
InlineJoinableFactory()

Method Summary

Modifier and Type	Method and 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 Detail

InlineJoinableFactory

public InlineJoinableFactory()

Method Detail

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