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https://issues.apache.org/jira/browse/CALCITE-4105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17151115#comment-17151115
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Vladimir Sitnikov commented on CALCITE-4105:
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Oh, I missed it. Thanks. Entry.hashCode is indeed unexpected.
> Replace Pair with Flat2List in RelDigestWriter to improve hash code
> distribution
> --------------------------------------------------------------------------------
>
> Key: CALCITE-4105
> URL: https://issues.apache.org/jira/browse/CALCITE-4105
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Assignee: Haisheng Yuan
> Priority: Major
>
> Pair hashCode uses XOR, Flat2List uses 31 prime multiplication.
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