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https://issues.apache.org/jira/browse/FLINK-6598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16012159#comment-16012159
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Fabian Hueske commented on FLINK-6598:
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Why should {{agg.getAggCallList.isEmpty}} not be allowed? I think it can be
executed and returns distinct keys. IMO, that's a useful operation.
> Fix `DataStreamGroupAggregateRule` matches error.
> -------------------------------------------------
>
> Key: FLINK-6598
> URL: https://issues.apache.org/jira/browse/FLINK-6598
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Reporter: sunjincheng
> Assignee: sunjincheng
> Fix For: 1.3.0
>
>
> Change {{DataStreamGroupWindowAggregateRule}} and
> {{DataStreamGroupAggregateRule}} retrun from {{!distinctAggs && !groupSets &&
> !agg.indicator}} to {{!distinctAggs && !groupSets && !agg.indicator &&
> !agg.getAggCallList.isEmpty}}.
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