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Posted to commits@calcite.apache.org by GitBox <gi...@apache.org> on 2020/05/20 07:03:05 UTC

[GitHub] [calcite] amaliujia commented on pull request #1985: [WIP][CALCITE-4011] Implement trait propagation for EnumerableProject…

amaliujia commented on pull request #1985:
URL: https://github.com/apache/calcite/pull/1985#issuecomment-631278902


   @hsyuan 
   
   This PR is what my understanding about traits pass down:
   
   EnumerableProject creates a new physical operator (EnumerableSort) based on requiredTrait, later it becomes a new Ruleset in planner, which is eligible for selection. By disabling several rules, this traits pass down code will generate the only usable plan (project at top, then a sort, and after that a scan)


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