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https://issues.apache.org/jira/browse/FLINK-3087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15032883#comment-15032883
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ASF GitHub Bot commented on FLINK-3087:
---------------------------------------
Github user ChengXiangLi commented on the pull request:
https://github.com/apache/flink/pull/1414#issuecomment-160822216
`a.count` and `b.count` may not the same all the times(for example is `a`
contains NULL values), that's why i try to aggregate it twice. But NULL value
is not allowed until now, so i can update the PR in your way and revisit this
issue after NULL value handling in Table API is enabled.
> Table API do not support multi count in aggregation.
> ----------------------------------------------------
>
> Key: FLINK-3087
> URL: https://issues.apache.org/jira/browse/FLINK-3087
> Project: Flink
> Issue Type: Bug
> Components: Table API
> Affects Versions: 0.10.0
> Reporter: Chengxiang Li
> Assignee: Chengxiang Li
>
> Multi {{count}} in aggregation is not supported, for example:
> {code:java}
> table.select("a.count", "b.count")
> {code}
> It's valid in grammar, besides, {{a.count}} and {{b.count}} may have
> different values actually if NULL value handling is enabled.
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