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()
void	splitVirtualColumns(VirtualColumns virtualColumns, List<VirtualColumn> preJoinVirtualColumns, List<VirtualColumn> postJoinVirtualColumns)

Methods inherited from class java.lang.Object

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

Method Detail

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()

splitVirtualColumns

public void splitVirtualColumns(VirtualColumns virtualColumns,
                                List<VirtualColumn> preJoinVirtualColumns,
                                List<VirtualColumn> postJoinVirtualColumns)

areSomeColumnsFromJoin

public boolean areSomeColumnsFromJoin(Collection<String> columns)

getColumnFromJoinIfExists

@Nullable
public JoinableClause getColumnFromJoinIfExists(String column)