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.
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