Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/5555#discussion_r182226785 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/AggregateUtil.scala --- @@ -1439,7 +1467,47 @@ object AggregateUtil { } } - (aggFieldIndexes, aggregates, accTypes, accSpecs) + // create distinct accumulator filter argument + val distinctAggs = new Array[Seq[DataViewSpec[_]]](aggregateCalls.size) + + aggregateCalls.zipWithIndex.foreach { + case (aggCall, index) => + if (aggCall.isDistinct) { + val argList: util.List[Integer] = aggCall.getArgList + // Only support single argument for distinct operation + if (argList.size() > 1) { + throw TableException( + "Cannot apply distinct filter on multiple input argument fields at this moment!") --- End diff -- Reword error message to `"DISTINCT aggregations with multiple parameters not fully supported yet."`.
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