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https://issues.apache.org/jira/browse/CALCITE-2622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16664091#comment-16664091
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Julian Hyde commented on CALCITE-2622:
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In [29046930|http://git-wip-us.apache.org/repos/asf/calcite/commit/29046930] I
made a small enhancement, interning these sets of SqlKind values (there are
only 6 valid combinations of DESC, NULLS FIRST, NULLS LAST).
> RexFieldCollation toString method is not deterministic
> -------------------------------------------------------
>
> Key: CALCITE-2622
> URL: https://issues.apache.org/jira/browse/CALCITE-2622
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Minor
> Fix For: 1.18.0
>
>
> It iterates over a set to print its flags.
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