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Posted to dev@drill.apache.org by GitBox <gi...@apache.org> on 2019/01/24 00:34:35 UTC

[GitHub] HanumathRao opened a new pull request #1620: DRILL-6997: Semijoin is changing the join ordering for some tpcds que…

HanumathRao opened a new pull request #1620: DRILL-6997: Semijoin is changing the join ordering for some tpcds que…
URL: https://github.com/apache/drill/pull/1620
 
 
   …ries.
   
   After transforming DrillJoin -- (DrillRel, DrillAgg) to DrillSemiJoinRel, join ordering is not considering the Semijoin with other joins in the query. This is resulting in sub-optimal plans during the planning phase. The following code changes are made to resolve the issue.
   a) A new rule DrillSemiJoinRule is introduced to transform the above pattern to DrillSemiJoinRel.
   b) RowType of the DrillSemiJoinRel is same as that of Drill's join relations. 
   c) validity checks are overloaded to check for the appropriate row type.
   
   @amansinha100  Can you please review this PR.

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