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From weijie tong <tongweijie...@gmail.com>
Subject Re: Is it possible to delegate data joins and filtering to the datasource ?
Date Wed, 29 Mar 2017 02:15:29 GMT
my suggestion is you define a rule which matches the DrillJoinRel RelNode ,
then at the onMatch method ,you traverse the join children to find the
ScanRel nodes . You define a new ScanRel which include the ScanRel nodes
you find last step. Then transform the JoinRel to this equivalent new
Finally , the plan tree will not have the JoinRel but the ScanRel.   You
can let your join plan rule  in the PlannerPhase.JOIN_PLANNING.

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