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https://issues.apache.org/jira/browse/CALCITE-6850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17929472#comment-17929472
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Ruben Q L commented on CALCITE-6850:
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[~jensen], actually [~suibianwanwan33] found a way to reproduce this issue,
please check CALCITE-6852
> Fix In ProjectRemoveRule stripped always get HepRelVertex type
> --------------------------------------------------------------
>
> Key: CALCITE-6850
> URL: https://issues.apache.org/jira/browse/CALCITE-6850
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.39.0
> Reporter: Zhen Chen
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.39.0
>
>
> The stripped type always is HepRelVertex, Project type will not appear. The
> logic of determining whether it is a project type will not be used. But it's
> difficult to construct an example using SQL.
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