Chunhui Shi created DRILL-5353:
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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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