Package org.apache.pinot.query.runtime.operator.utils

Class AggregationUtils

java.lang.Object

org.apache.pinot.query.runtime.operator.utils.AggregationUtils

public class AggregationUtils
extends Object

Utility class to perform accumulation over a collection of rows. It provides utils for the following: (1) method to deal with aggregation key and (2) method to merge a row into an existing accumulator

Accumulation is used by WindowAggregateOperator and AggregateOperator.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	AggregationUtils.Accumulator	Accumulator class which accumulates the aggregated results into the group sets if any
static interface	AggregationUtils.Merger

Method Summary

Modifier and Type	Method	Description
static Key	extractEmptyKey()
static Key	extractRowKey(Object[] row, List<RexExpression> groupSet)

Methods inherited from class java.lang.Object

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

Method Detail

extractRowKey

public static Key extractRowKey(Object[] row,
                                List<RexExpression> groupSet)

extractEmptyKey

public static Key extractEmptyKey()