Package com.orientechnologies.orient.core.sql.functions.coll

Class OSQLFunctionUnionAll

java.lang.Object

com.orientechnologies.orient.core.sql.functions.OSQLFunctionAbstract

com.orientechnologies.orient.core.sql.functions.OSQLFunctionConfigurableAbstract

com.orientechnologies.orient.core.sql.functions.coll.OSQLFunctionMultiValueAbstract<Collection<Object>>

com.orientechnologies.orient.core.sql.functions.coll.OSQLFunctionUnionAll

All Implemented Interfaces:

OSQLFunction

public class OSQLFunctionUnionAll
extends OSQLFunctionMultiValueAbstract<Collection<Object>>

This operator can work as aggregate or inline. If only one argument is passed than aggregates, otherwise executes, and returns, a UNION of the collections received as parameters. Works also with no collection values. Does not remove duplication from the result.

Author:

Luca Garulli (l.garulli--(at)--orientdb.com)

Field Summary

Fields

Modifier and Type	Field	Description
static final String	NAME

Fields inherited from class com.orientechnologies.orient.core.sql.functions.coll.OSQLFunctionMultiValueAbstract

context

Fields inherited from class com.orientechnologies.orient.core.sql.functions.OSQLFunctionConfigurableAbstract

configuredParameters

Fields inherited from class com.orientechnologies.orient.core.sql.functions.OSQLFunctionAbstract

maxParams, minParams, name

Constructor Summary

Constructors

Constructor	Description
OSQLFunctionUnionAll()

Method Summary

Modifier and Type	Method	Description
Object	execute(Object iThis, OIdentifiable iCurrentRecord, Object iCurrentResult, Object[] iParams, OCommandContext iContext)	Process a record.
String	getSyntax()	Returns a convenient SQL String representation of the function.
Object	mergeDistributedResult(List<Object> resultsToMerge)	This method correspond to distributed query execution

Methods inherited from class com.orientechnologies.orient.core.sql.functions.coll.OSQLFunctionMultiValueAbstract

aggregateResults, getResult, shouldMergeDistributedResult

Methods inherited from class com.orientechnologies.orient.core.sql.functions.OSQLFunctionConfigurableAbstract

config, toString

Methods inherited from class com.orientechnologies.orient.core.sql.functions.OSQLFunctionAbstract

filterResult, getDatabase, getDistributedStorageId, getMaxParams, getMinParams, getName, getSingleItem, getSingleProperty, returnDistributedResult, setResult

Methods inherited from class java.lang.Object

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

Field Details

NAME

public static final String NAME

See Also:

• Constant Field Values

Constructor Details

OSQLFunctionUnionAll

public OSQLFunctionUnionAll()

Method Details

execute

public Object execute(Object iThis,
 OIdentifiable iCurrentRecord,
 Object iCurrentResult,
 Object[] iParams,
 OCommandContext iContext)

Description copied from interface: OSQLFunction

Process a record.

iCurrentRecord - : current record

iCurrentResult - TODO

iParams - : function parameters, number is ensured to be within minParams and maxParams.

iContext - : object calling this function

Returns:

function result, can be null. Special cases : can be null if function aggregate results, can be null if function filter results : this mean result is excluded

getSyntax

public String getSyntax()

Description copied from interface: OSQLFunction

Returns a convenient SQL String representation of the function.

Example :

  myFunction( param1, param2, [optionalParam3])
 

This text will be used in exception messages.

Returns:

String , never null.

mergeDistributedResult

public Object mergeDistributedResult(List<Object> resultsToMerge)

Description copied from interface: OSQLFunction

This method correspond to distributed query execution

Specified by:

mergeDistributedResult in interface OSQLFunction

Overrides:

mergeDistributedResult in class OSQLFunctionAbstract

Parameters:

resultsToMerge - is the results that comes from different nodes

Returns:

is the valid merged result