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https://issues.apache.org/jira/browse/CALCITE-889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14944174#comment-14944174
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Julian Hyde commented on CALCITE-889:
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{quote}I would like to know the currentRel’s type (whether it is Sort or not)
which is wrapped in HepRelVertex. That is the reason why I do a cast. I know
this will only work for HepPlanner. Could you please let me know what should I
do to extend this to work for VolcanoPlanner? If there is any example rules
that apply to VolcanoPlanner, could you point me there and let me take a
look?{quote}
I don't think you need to look for a Sort explicitly. You should look for an
input where you don't need to push down. What [~jcamachorodriguez] did in
SortJoinTransposeRule CALCITE-892 was to look for inputs whose estimated row
count is less than the limit. Such inputs have probably had the rule applied
already. I think you could do the same.
> 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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