godfreyhe commented on issue #1157: [CALCITE-2969] Improve design of join-like 
relational expressions
URL: https://github.com/apache/calcite/pull/1157#issuecomment-490326969
 
 
   hi @danny0405,  `RelDecorrelator` does not handle `SemiJoin` before, which 
is handled by `Frame decorrelateRel(RelNode rel)` method. I think, `Frame 
decorrelateRel(LogicalJoin rel)` should handle SEMI join now.

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