Package com.illumon.iris.db.v2.by

Class FirstOrLastByAggregationFactory

java.lang.Object

com.illumon.iris.db.v2.by.FirstOrLastByAggregationFactory

All Implemented Interfaces:

AggregationContextFactory

public class FirstOrLastByAggregationFactory
extends Object
implements AggregationContextFactory

Field Summary

Fields

Modifier and Type	Field	Description
static boolean	ENABLE_UNTRACKED_LAST_BY

Constructor Summary

Constructors

Constructor	Description
FirstOrLastByAggregationFactory(boolean isFirst)
FirstOrLastByAggregationFactory(boolean isFirst, String exposeRedirection)

Method Summary

Modifier and Type	Method	Description
boolean	allowKeyOnlySubstitution()	Should we allow substitution with a KeyOnlyAggregationFactory (e.g.
com.illumon.iris.db.v2.by.AggregationContext	makeAggregationContext(Table table, String... groupByColumns)	Make an AggregationContext for this aggregation.
String	toString()

Methods inherited from class java.lang.Object

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

Field Details

ENABLE_UNTRACKED_LAST_BY

public static boolean ENABLE_UNTRACKED_LAST_BY

Constructor Details

FirstOrLastByAggregationFactory

public FirstOrLastByAggregationFactory(boolean isFirst)

FirstOrLastByAggregationFactory

public FirstOrLastByAggregationFactory(boolean isFirst,
 String exposeRedirection)

Method Details

allowKeyOnlySubstitution

public boolean allowKeyOnlySubstitution()

Description copied from interface: AggregationContextFactory

Should we allow substitution with a KeyOnlyAggregationFactory (e.g. selectDistinct) when there are only key columns? Instances whose operators could have side effects or are already KeyOnlyAggregationFactory should return false.

Specified by:

allowKeyOnlySubstitution in interface AggregationContextFactory

Returns:

Whether to allow a KeyOnlyAggregationFactory to be substituted for this when there are only key columns

makeAggregationContext

public com.illumon.iris.db.v2.by.AggregationContext makeAggregationContext(@NotNull
 Table table,
 @NotNull
 String... groupByColumns)

Description copied from interface: AggregationContextFactory

Make an AggregationContext for this aggregation.

Specified by:

makeAggregationContext in interface AggregationContextFactory

Parameters:

table - The source Table to aggregate

groupByColumns - The key column names

Returns:

A new or safely reusable AggregationContext

toString

public String toString()

Overrides:

toString in class Object