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https://issues.apache.org/jira/browse/CALCITE-1584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16031351#comment-16031351
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Julian Hyde commented on CALCITE-1584:
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Calcite doesn't promise to retain field names. 95% of the time it can and does,
but 5% of the time it really can't retain field names without seriously
compromising the Volcano engine.
I think I should close this bug as "not a bug".
To address [[email protected]]'s original problem, we could make RelBuilder
smarter: if it sees {{Project(a as x, b as y, c as z)}} on top of {{Project(a,
b, d + e as c)}}, it should fold them to {{Project(a as x, b as y, d + e as
z)}}. But we can't do much with ProjectRemoveRule.
> ProjectRemoveRule loses field names
> -----------------------------------
>
> Key: CALCITE-1584
> URL: https://issues.apache.org/jira/browse/CALCITE-1584
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Jess Balint
> Assignee: Julian Hyde
> Priority: Minor
>
> the rule doesn't properly identify a child {{Project}} node
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