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https://issues.apache.org/jira/browse/CALCITE-6994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17952999#comment-17952999
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Zhen Chen commented on CALCITE-6994:
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[~mbudiu] I checked with {{git blame}} and saw that this code was added a long
time ago by Julian. There's special handling for MULTISET here, but I don't
quite understand the rationale behind it. The code is
[here|https://github.com/apache/calcite/blame/60e1b72fa164f0e06740bd3bf3f46a9725a87ab8/core/src/main/java/org/apache/calcite/rex/RexBuilder.java#L2151].
> Enhance RexBuilder#makeIn to create SEARCH for MULTISET literals
> ----------------------------------------------------------------
>
> Key: CALCITE-6994
> URL: https://issues.apache.org/jira/browse/CALCITE-6994
> Project: Calcite
> Issue Type: Improvement
> Reporter: xiong duan
> Assignee: Zhen Chen
> Priority: Major
> Labels: pull-request-available
>
> The issue was discovered at [https://github.com/apache/calcite/pull/4345.]
>
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