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From shaoxuan-wang <...@git.apache.org>
Subject [GitHub] flink pull request #3470: [FLINK-5956] [table] Add retract method for aggreg...
Date Sun, 05 Mar 2017 04:47:20 GMT
Github user shaoxuan-wang commented on a diff in the pull request:

    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/AggregateFunction.scala
    @@ -35,6 +36,18 @@ abstract class AggregateFunction[T] extends UserDefinedFunction {
       def createAccumulator(): Accumulator
    +    * Retract the input values from the accumulator instance.
    --- End diff --
     I was thinking further for the dataStream retraction where the source table could send
out of date retraction message. But let us add this assumption for now.

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