org.teiid.query.function.aggregate

Class RankingFunction

java.lang.Object

org.teiid.query.function.aggregate.AggregateFunction

org.teiid.query.function.aggregate.RankingFunction

public class RankingFunction
extends AggregateFunction

computes rank/dense_rank

Field Summary

Fields inherited from class org.teiid.query.function.aggregate.AggregateFunction

argIndexes

Constructor Summary

Constructors

Constructor and Description
RankingFunction(AggregateSymbol.Type function)

Method Summary

Modifier and Type	Method and Description
void	addInputDirect(List<?> tuple, CommandContext commandContext) Called for the element value in every row of a group.
Object	getResult(CommandContext commandContext) Called after all values have been processed to get the result.
void	reset() Called to reset the state of the function.

Methods inherited from class org.teiid.query.function.aggregate.AggregateFunction

addInput, filter, getArgIndexes, getOutputType, getState, getStateTypes, initialize, respectsNull, setArgIndexes, setConditionIndex, setState

Methods inherited from class java.lang.Object

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

Constructor Detail

RankingFunction

public RankingFunction(AggregateSymbol.Type function)

Method Detail

reset

public void reset()

Description copied from class: AggregateFunction

Called to reset the state of the function.

Specified by:

reset in class AggregateFunction

addInputDirect

public void addInputDirect(List<?> tuple,
                           CommandContext commandContext)
                    throws FunctionExecutionException,
                           ExpressionEvaluationException,
                           TeiidComponentException

Description copied from class: AggregateFunction

Called for the element value in every row of a group.

Specified by:

addInputDirect in class AggregateFunction

Throws:

FunctionExecutionException

ExpressionEvaluationException

TeiidComponentException

getResult

public Object getResult(CommandContext commandContext)
                 throws FunctionExecutionException,
                        ExpressionEvaluationException,
                        TeiidComponentException

Description copied from class: AggregateFunction

Called after all values have been processed to get the result.

Specified by:

getResult in class AggregateFunction

Returns:

Result value

Throws:

FunctionExecutionException

ExpressionEvaluationException

TeiidComponentException