Github user jinfengni commented on the pull request:
https://github.com/apache/drill/pull/444#issuecomment-201105381
We did have other rules getting applied mixed convention. For DRILL-3855,
I'll fix push filter/project past setop rules. I'll open another JIRA to go
through all the other rules.
Even with the mixed convention, the issue reported in this jira did not
always happen for every query. That's probably why we did not encountered more
such cases before.
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