Package org.apache.druid.segment.join.filter

Class JoinableClauses

java.lang.Object

org.apache.druid.segment.join.filter.JoinableClauses

public class JoinableClauses
extends Object

Method Summary

Modifier and Type	Method	Description
boolean	areSomeColumnsFromJoin(Collection<String> columns)
static JoinableClauses	createClauses(List<PreJoinableClause> preClauses, JoinableFactory joinableFactory)	Builds a list of JoinableClause corresponding to a list of PreJoinableClause.
static JoinableClauses	fromList(List<JoinableClause> clauses)	Wraps the provided list of pre-built JoinableClause.
JoinableClause	getColumnFromJoinIfExists(String column)
List<JoinableClause>	getJoinableClauses()
Set<VirtualColumn>	getPostJoinVirtualColumns(VirtualColumns virtualColumns)	Retrieve subset of virtual columns which require inputs which are only present on the join table

Methods inherited from class java.lang.Object

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

Method Details

createClauses

public static JoinableClauses createClauses(List<PreJoinableClause> preClauses,
 JoinableFactory joinableFactory)

Builds a list of JoinableClause corresponding to a list of PreJoinableClause. This will call JoinableFactory.build(org.apache.druid.query.DataSource, org.apache.druid.segment.join.JoinConditionAnalysis) on each one and therefore may be an expensive operation.

fromList

public static JoinableClauses fromList(List<JoinableClause> clauses)

Wraps the provided list of pre-built JoinableClause. This is an inexpensive operation.

getJoinableClauses

@Nonnull
public List<JoinableClause> getJoinableClauses()

getPostJoinVirtualColumns

public Set<VirtualColumn> getPostJoinVirtualColumns(VirtualColumns virtualColumns)

Retrieve subset of virtual columns which require inputs which are only present on the join table

areSomeColumnsFromJoin

public boolean areSomeColumnsFromJoin(Collection<String> columns)

getColumnFromJoinIfExists

@Nullable
public JoinableClause getColumnFromJoinIfExists(String column)