Package se.kuseman.payloadbuilder.api.expression

Interface IAggregator

public interface IAggregator

Definition of an aggregator. This is created once for each expression that is used during an aggregation session to keep state until stream is complete

Method Summary

Modifier and Type	Method	Description
void	appendGroup(TupleVector input, ValueVector groupIds, ValueVector selections, IExecutionContext context)	Appends a group data to aggregator.
ValueVector	combine(IExecutionContext context)	Combine the aggregators state into a resulting ValueVector.

Method Details

appendGroup

void appendGroup(TupleVector input,
 ValueVector groupIds,
 ValueVector selections,
 IExecutionContext context)

Appends a group data to aggregator.

Parameters:

input - The input vector

groupIds - Integer Vector with group ids

selections - Vector with selections for each group. Type is Array[Int]. Same size as @param groupIds

combine

ValueVector combine(IExecutionContext context)

Combine the aggregators state into a resulting ValueVector. The resulting vector must contain and be ordered by all the groupId's provided by #appendGroup(TupleVector, IExecutionContext)