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From fhueske <...@git.apache.org>
Subject [GitHub] flink pull request #3735: [FLINK-6242] [table] Add code generation for DataS...
Date Tue, 18 Apr 2017 15:22:46 GMT
Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3735#discussion_r111983678
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/DataSetAggFunction.scala
---
    @@ -68,23 +72,16 @@ class DataSetAggFunction(
       override def reduce(records: Iterable[Row], out: Collector[Row]): Unit = {
     
         // create accumulators
    -    var i = 0
    -    while (i < aggregates.length) {
    -      accumulators(i) = aggregates(i).createAccumulator()
    -      i += 1
    -    }
    +    accumulators = function.createAccumulators()
     
         val iterator = records.iterator()
     
         while (iterator.hasNext) {
           val record = iterator.next()
    +      var i = 0
     
           // accumulate
    -      i = 0
    -      while (i < aggregates.length) {
    -        aggregates(i).accumulate(accumulators(i), record.getField(aggInFields(i)(0)))
    -        i += 1
    -      }
    +      function.accumulate(accumulators, record)
     
           // check if this record is the last record
           if (!iterator.hasNext) {
    --- End diff --
    
    Couldn't we use `function.setForwardFields()` to forward the grouping keys to the output?


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