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https://issues.apache.org/jira/browse/CALCITE-2535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16611728#comment-16611728
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Julian Hyde commented on CALCITE-2535:
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It seems that constant folding is not a concern for that code.
I won't take the time explaining identity. It was a possible solution to a
hypothetical problem.
> Runtime failure check not working in SqlTesterImpl.java
> -------------------------------------------------------
>
> Key: CALCITE-2535
> URL: https://issues.apache.org/jira/browse/CALCITE-2535
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Hongze Zhang
> Assignee: Julian Hyde
> Priority: Major
>
> Problem at SqlTesterImpl#checkFails:
> When argument "runtime" is specified as true, error assertion and error
> message matching will not be performed.
> This issue could result in wrong test result in SqlOperatorBaseTest.
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