amansinha100 commented on a change in pull request #1620: DRILL-6997: Semijoin
is changing the join ordering for some tpcds que…
URL: https://github.com/apache/drill/pull/1620#discussion_r251210970
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/handlers/DefaultSqlHandler.java
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@@ -277,6 +277,12 @@ protected DrillRel convertToRawDrel(final RelNode
relNode) throws SqlUnsupported
}
}
+ /*Ideally this conversion can be handled during logical planning phase
itself but currently the join ordering algorithm in calcite
+ is not considering the semi-joins. This can lead to sub optimal plans.
Hence converting the joins to semi-joins post join planning.*/
Review comment:
For future reference, pls add the CALCITE-xxx JIRA number for this.
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