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

Class AggregateOperator

java.lang.Object

org.apache.pinot.query.runtime.operator.MultiStageOperator

org.apache.pinot.query.runtime.operator.AggregateOperator

All Implemented Interfaces:

AutoCloseable, Operator<TransferableBlock>

public class AggregateOperator
extends MultiStageOperator

AggregateOperator is used to aggregate values over a set of group by keys. Output data will be in the format of [group by key, aggregate result1, ... aggregate resultN] Currently, we only support the following aggregation functions: 1. SUM 2. COUNT 3. MIN 4. MAX 5. DistinctCount and Count(Distinct) 6. AVG 7. FourthMoment 8. BoolAnd and BoolOr When the list of aggregation calls is empty, this class is used to calculate distinct result based on group by keys. In this case, the input can be any type. If the list of aggregation calls is not empty, the input of aggregation has to be a number. Note: This class performs aggregation over the double value of input. If the input is single value, the output type will be input type. Otherwise, the output type will be double.

Field Summary

Fields inherited from class org.apache.pinot.query.runtime.operator.MultiStageOperator

_context, _opChainStats, _operatorId

Constructor Summary

Constructors

Constructor	Description
AggregateOperator(OpChainExecutionContext context, MultiStageOperator inputOperator, DataSchema resultSchema, DataSchema inputSchema, List<RexExpression> aggCalls, List<RexExpression> groupSet, AggregateNode.AggType aggType, List<Integer> filterArgIndices, AbstractPlanNode.NodeHint nodeHint)

Method Summary

Modifier and Type	Method	Description
List<MultiStageOperator>	getChildOperators()
protected TransferableBlock	getNextBlock()
String	toExplainString()

Methods inherited from class org.apache.pinot.query.runtime.operator.MultiStageOperator

cancel, close, getOperatorId, nextBlock, shouldCollectStats

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.pinot.core.common.Operator

explainPlan, getExecutionStatistics, getIndexSegment, prepareForExplainPlan

Constructor Detail

AggregateOperator

public AggregateOperator(OpChainExecutionContext context,
                         MultiStageOperator inputOperator,
                         DataSchema resultSchema,
                         DataSchema inputSchema,
                         List<RexExpression> aggCalls,
                         List<RexExpression> groupSet,
                         AggregateNode.AggType aggType,
                         @Nullable
                         List<Integer> filterArgIndices,
                         @Nullable
                         AbstractPlanNode.NodeHint nodeHint)

Method Detail

getChildOperators

public List<MultiStageOperator> getChildOperators()

Specified by:

getChildOperators in interface Operator<TransferableBlock>

Overrides:

getChildOperators in class MultiStageOperator

toExplainString

@Nullable
public String toExplainString()

getNextBlock

protected TransferableBlock getNextBlock()

Specified by:

getNextBlock in class MultiStageOperator