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https://issues.apache.org/jira/browse/CALCITE-1448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15590842#comment-15590842
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Julian Hyde commented on CALCITE-1448:
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I'm working on variants of {{UnionMergeRule}} that work on {{Intersect}} and
{{Minus}}.
Note that it is not valid to merge {{Minus}} right-deep: {{Minus(a, Minus(b,
c))}} is not equivalent to {{Minus(a, b, c)}}.
> Add a rule to merge INTERSECT with its children INTERSECT
> ---------------------------------------------------------
>
> Key: CALCITE-1448
> URL: https://issues.apache.org/jira/browse/CALCITE-1448
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Pengcheng Xiong
> Assignee: Julian Hyde
>
> similar to current unionMergeRule.
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