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https://issues.apache.org/jira/browse/CALCITE-889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14877343#comment-14877343
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Julian Hyde commented on CALCITE-889:
-------------------------------------
Further comments:
* Replace "SortProjectTransposeRule" comment.
* It is not valid to apply the rule if Union.all is false.
* It is not valid to apply the rule if Sort.offset is not null.
* If is valid to apply the rule if Sort.fetch is null, but pointless, given
that union does not in general propagate sort order. Therefore I would apply
the rule only if Sort.fetch is not null.
* We want this to be a general-purpose rule that can run in the VolcanoPlanner
was well as HepPlanner, therefore the rule must not cast its inputs to
HepRelVertex.
> Implement SortUnionTransposeRule
> --------------------------------
>
> Key: CALCITE-889
> URL: https://issues.apache.org/jira/browse/CALCITE-889
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Pengcheng Xiong
> Assignee: Julian Hyde
> Attachments: CALCITE-889.01.patch
>
>
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