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https://issues.apache.org/jira/browse/CALCITE-2116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16385589#comment-16385589
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LeoWangLZ commented on CALCITE-2116:
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[~julianhyde] ok, it like Spool that it has one producer and multiple
consumers. Thanks
> The digests are not same for the common sub-expressions in HepPlanner
> ---------------------------------------------------------------------
>
> Key: CALCITE-2116
> URL: https://issues.apache.org/jira/browse/CALCITE-2116
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.15.0
> Reporter: LeoWangLZ
> Assignee: Julian Hyde
> Priority: Major
> Fix For: 1.16.0
>
>
> The digests are not same for the same sub-query.
> like query
> {code:java}
> select * from (select * from dept union all select * from dept)a;
> {code}
> When run the query, The union relNode has two inputs, and it's same expectly
> and it's the same object instead of the print of plan, but Now they are not
> same.
> And for Test testReplaceCommonSubexpression, the rule is only firing once,
> but now it's two.
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