Github user sunjincheng121 commented on a diff in the pull request: https://github.com/apache/flink/pull/2792#discussion_r89247362 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/runtime/aggregate/AggregateUtil.scala --- @@ -39,66 +45,69 @@ object AggregateUtil { type JavaList[T] = java.util.List[T] /** - * Create Flink operator functions for aggregates. It includes 2 implementations of Flink - * operator functions: - * [[org.apache.flink.api.common.functions.MapFunction]] and - * [[org.apache.flink.api.common.functions.GroupReduceFunction]](if it's partial aggregate, - * should also implement [[org.apache.flink.api.common.functions.CombineFunction]] as well). - * The output of [[org.apache.flink.api.common.functions.MapFunction]] contains the - * intermediate aggregate values of all aggregate function, it's stored in Row by the following - * format: - * - * {{{ - * avg(x) aggOffsetInRow = 2 count(z) aggOffsetInRow = 5 - * | | - * v v - * +---------+---------+--------+--------+--------+--------+ - * |groupKey1|groupKey2| sum1 | count1 | sum2 | count2 | - * +---------+---------+--------+--------+--------+--------+ - * ^ - * | - * sum(y) aggOffsetInRow = 4 - * }}} - * - */ - def createOperatorFunctionsForAggregates( - namedAggregates: Seq[CalcitePair[AggregateCall, String]], - inputType: RelDataType, - outputType: RelDataType, - groupings: Array[Int]) - : (MapFunction[Any, Row], RichGroupReduceFunction[Row, Row]) = { - - val aggregateFunctionsAndFieldIndexes = - transformToAggregateFunctions(namedAggregates.map(_.getKey), inputType, groupings.length) - // store the aggregate fields of each aggregate function, by the same order of aggregates. - val aggFieldIndexes = aggregateFunctionsAndFieldIndexes._1 - val aggregates = aggregateFunctionsAndFieldIndexes._2 + * Create prepare MapFunction for aggregates. + * The output of [[org.apache.flink.api.common.functions.MapFunction]] contains the + * intermediate aggregate values of all aggregate function, it's stored in Row by the following + * format: + * + * {{{ + * avg(x) aggOffsetInRow = 2 count(z) aggOffsetInRow = 5 + * | | + * v v + * +---------+---------+--------+--------+--------+--------+ + * |groupKey1|groupKey2| sum1 | count1 | sum2 | count2 | + * +---------+---------+--------+--------+--------+--------+ + * ^ + * | + * sum(y) aggOffsetInRow = 4 + * }}} + * + */ + private[flink] def createPrepareMapFunction( + aggregates: Array[Aggregate[_ <: Any]], + aggFieldIndexes: Array[Int], + groupings: Array[Int], + inputType: + RelDataType): MapFunction[Any, Row] = { val mapReturnType: RowTypeInfo = createAggregateBufferDataType(groupings, aggregates, inputType) val mapFunction = new AggregateMapFunction[Row, Row]( - aggregates, aggFieldIndexes, groupings, - mapReturnType.asInstanceOf[RowTypeInfo]).asInstanceOf[MapFunction[Any, Row]] - - // the mapping relation between field index of intermediate aggregate Row and output Row. - val groupingOffsetMapping = getGroupKeysMapping(inputType, outputType, groupings) - - // the mapping relation between aggregate function index in list and its corresponding - // field index in output Row. - val aggOffsetMapping = getAggregateMapping(namedAggregates, outputType) - - if (groupingOffsetMapping.length != groupings.length || - aggOffsetMapping.length != namedAggregates.length) { - throw new TableException("Could not find output field in input data type " + - "or aggregate functions.") - } - - val allPartialAggregate = aggregates.map(_.supportPartial).forall(x => x) + aggregates, + aggFieldIndexes, + groupings, + mapReturnType.asInstanceOf[RowTypeInfo]).asInstanceOf[MapFunction[Any, Row]] - val intermediateRowArity = groupings.length + aggregates.map(_.intermediateDataType.length).sum + mapFunction + } - val reduceGroupFunction = + /** + * Create AggregateGroupReduceFunction for aggregates. It implement + * [[org.apache.flink.api.common.functions.GroupReduceFunction]](if it's partial aggregate, + * should also implement [[org.apache.flink.api.common.functions.CombineFunction]] as well). + * + */ + def createAggregateGroupReduceFunction( + namedAggregates: Seq[CalcitePair[AggregateCall, String]], + inputType: RelDataType, + outputType: RelDataType, + groupings: Array[Int], + aggregates: Array[Aggregate[_ <: Any]]): RichGroupReduceFunction[Row, Row] = { --- End diff -- yes.
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