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https://issues.apache.org/jira/browse/CALCITE-2287?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-2287.
----------------------------------
Resolution: Fixed
Fix Version/s: 1.17.0
Test case in
[08e43229|http://git-wip-us.apache.org/repos/asf/calcite/commit/08e43229] and
fixed in
[7924eb0e|http://git-wip-us.apache.org/repos/asf/calcite/commit/7924eb0e].
Thanks [~zhong.j.yu] and [~zhenw]!
> 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
> Fix For: 1.17.0
>
>
> 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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