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Pengcheng Xiong commented on CALCITE-1448:
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Hi [~jhyde.apa...@gmail.com], thanks for your patch. The merge rule can be
further improved for {code} topOp.all != bottomOp.all {code} for union and
intersect cases. Right now, it is covering the cases {code} topOp.all,
bottomOp.all {code} are {code}true,true{code},{code}false,false{code}.
Actually, it should also cover the case {code}false,true{code}. That is, if
the top level is distinct, we can always merge.
> Add rules to flatten and prune Intersect and Minus
> --------------------------------------------------
>
> Key: CALCITE-1448
> URL: https://issues.apache.org/jira/browse/CALCITE-1448
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Pengcheng Xiong
> Assignee: Julian Hyde
> Fix For: 1.11.0
>
>
> similar to current unionMergeRule.
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