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https://issues.apache.org/jira/browse/CALCITE-2287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16456028#comment-16456028
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Zhong Yu commented on CALCITE-2287:
-----------------------------------
https://github.com/apache/calcite/pull/682
> StackOverflowError from FlatList equals()
> -----------------------------------------
>
> Key: CALCITE-2287
> URL: https://issues.apache.org/jira/browse/CALCITE-2287
> Project: Calcite
> Issue Type: Bug
> Reporter: Zhong Yu
> Assignee: Julian Hyde
> Priority: Major
>
> The equals() method of `Flat3List` and `Flat4List` may invoke each other in
> an infinite loop.
> See also https://issues.apache.org/jira/browse/HIVE-18427
>
> We found this problem when such lists are used as keys in
> `RelMetadataQuery.map`; occasionally there are hashcode collisions between
> `Flat3List` and `Flat4List`, hence their equals() methods will be invoked.
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