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https://issues.apache.org/jira/browse/FLINK-4832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15690049#comment-15690049
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ASF GitHub Bot commented on FLINK-4832:
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Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/2840
If we fix this issue with a `RelOptRule` we can do all tests with the
`TableTestBase` because the `DataSetValues` with the emptry record will show up
in the plan.
> Count/Sum 0 elements
> --------------------
>
> Key: FLINK-4832
> URL: https://issues.apache.org/jira/browse/FLINK-4832
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Anton Mushin
>
> Currently, the Table API is unable to count or sum up 0 elements. We should
> improve DataSet aggregations for this. Maybe by union the original DataSet
> with a dummy record or by using a MapPartition function. Coming up with a
> good design for this is also part of this issue.
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