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https://issues.apache.org/jira/browse/CALCITE-1932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16117384#comment-16117384
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MinJi Kim commented on CALCITE-1932:
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Thank you for reviewing this PR! Thanks! -Minji
https://github.com/apache/calcite/pull/512
> Project.getPermutation() should return null if a column is repeated
> -------------------------------------------------------------------
>
> Key: CALCITE-1932
> URL: https://issues.apache.org/jira/browse/CALCITE-1932
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: MinJi Kim
> Assignee: Julian Hyde
>
> Project.getPermutation() returns true when the project is referencing [$1,
> $1]. If a column repeats, it should not be considered a permutation.
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