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From "Chunhui Shi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-5353) Merge "Project on Project" generated in physical plan stage
Date Tue, 14 Mar 2017 04:21:41 GMT
Chunhui Shi created DRILL-5353:
----------------------------------

             Summary: Merge "Project on Project" generated in physical plan stage
                 Key: DRILL-5353
                 URL: https://issues.apache.org/jira/browse/DRILL-5353
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Chunhui Shi
            Assignee: Chunhui Shi


There is possibility physical plan stage we will get a project-on-project plan. But the ProjectMergeRule(DrillMergeProjectRule)
is only for logical planning. We need to apply the rule in physical plan stage as well.

And even after planning stage, the JoinPrelRenameVisitor could also inject extra Project which
can be merged with (if there is one) Project underneath.



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