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https://issues.apache.org/jira/browse/CALCITE-6869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17931518#comment-17931518
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suibianwanwan commented on CALCITE-6869:
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A small suggestion, how about adding this comment in the planner or in the
Project .
> Add instructions for the alias loss problem in ProjectRemoveRule
> ----------------------------------------------------------------
>
> Key: CALCITE-6869
> URL: https://issues.apache.org/jira/browse/CALCITE-6869
> Project: Calcite
> Issue Type: Improvement
> Reporter: Zhen Chen
> Assignee: Zhen Chen
> Priority: Minor
> Labels: pull-request-available
>
> We should add a description of the alias loss problem and the current calcite
> solution in ProjectRemoveRule to avoid this issue being raised again.
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