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https://issues.apache.org/jira/browse/CALCITE-3598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16994577#comment-16994577
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Stamatis Zampetakis commented on CALCITE-3598:
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Thanks for the analysis [~rubenql]. If the original code was working correctly
(even by chance) then maybe it is working correctly by chance in other projects
using Calcite. If we go on with the changes in CALCITE-3535 and CALCITE-3576
aren't we risking a regression?
> ClassCastException in MaterializationTest testJoinMaterialization8 and
> testJoinMaterialization9
> -----------------------------------------------------------------------------------------------
>
> Key: CALCITE-3598
> URL: https://issues.apache.org/jira/browse/CALCITE-3598
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.21.0
> Reporter: Ruben Q L
> Priority: Minor
> Attachments: codeHashJoin.txt, codeNestedLoopJoin.txt
>
>
> Problem unveiled by CALCITE-3535, and also separately by CALCITE-3576.
> When CALCITE-3535 was committed, it made
> {{MaterializationTest#testJoinMaterialization8}} and
> {{MaterializationTest#testJoinMaterialization9}} change their execution plan
> from hashJoin to nestedLoopJoin. This caused an exception
> {code}
> java.lang.ClassCastException: java.lang.String$CaseInsensitiveComparator
> cannot be cast to java.lang.String
> {code}
> which seems unrelated to CALCITE-3535 (or CALCITE-3576), so the tests were
> temporarily disabled.
> The goal of this ticket is to investigate the root cause of this issue and
> re-activate both tests.
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