com.orientechnologies.orient.core.sql.parser

Class AggregateProjectionSplit

java.lang.Object

com.orientechnologies.orient.core.sql.parser.AggregateProjectionSplit

public class AggregateProjectionSplit
extends Object

This class is used by the query planner to split projections in three parts:

• pre-aggregate projections
• aggregate projections
• post-aggregate projections

An example: select max(a + b) + (max(b + c * 2) + 1 + 2) * 3 as foo, max(d) + max(e), f from " + className will become a + b AS _$$$OALIAS$$_1, b + c * 2 AS _$$$OALIAS$$_3, d AS _$$$OALIAS$$_5, e AS _$$$OALIAS$$_7, f max(_$$$OALIAS$$_1) AS _$$$OALIAS$$_0, max(_$$$OALIAS$$_3) AS _$$$OALIAS$$_2, max(_$$$OALIAS$$_5) AS _$$$OALIAS$$_4, max(_$$$OALIAS$$_7) AS _$$$OALIAS$$_6, f _$$$OALIAS$$_0 + (_$$$OALIAS$$_2 + 1 + 2) * 3 AS `foo`, _$$$OALIAS$$_4 + _$$$OALIAS$$_6 AS `max(d) + max(e)`, f

Author:

Luigi Dell'Aquila (l.dellaquila-(at)-orientdb.com)

Field Summary

Fields

Modifier and Type	Field and Description
protected List<OProjectionItem>	aggregate
protected static String	GENERATED_ALIAS_PREFIX
protected int	nextAliasId
protected List<OProjectionItem>	preAggregate

Constructor Summary

Constructors

Constructor and Description
AggregateProjectionSplit()

Method Summary

Modifier and Type	Method and Description
List<OProjectionItem>	getAggregate()
OIdentifier	getNextAlias()
List<OProjectionItem>	getPreAggregate()
void	reset() clean the content, but NOT the counter!
void	setAggregate(List<OProjectionItem> aggregate)
void	setPreAggregate(List<OProjectionItem> preAggregate)

Methods inherited from class java.lang.Object

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

Field Detail

GENERATED_ALIAS_PREFIX

protected static final String GENERATED_ALIAS_PREFIX

See Also:

Constant Field Values

nextAliasId

protected int nextAliasId

preAggregate

protected List<OProjectionItem> preAggregate

aggregate

protected List<OProjectionItem> aggregate

Constructor Detail

AggregateProjectionSplit

public AggregateProjectionSplit()

Method Detail

getNextAlias

public OIdentifier getNextAlias()

getPreAggregate

public List<OProjectionItem> getPreAggregate()

setPreAggregate

public void setPreAggregate(List<OProjectionItem> preAggregate)

getAggregate

public List<OProjectionItem> getAggregate()

setAggregate

public void setAggregate(List<OProjectionItem> aggregate)

reset

public void reset()

clean the content, but NOT the counter!