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https://issues.apache.org/jira/browse/CALCITE-3809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17252498#comment-17252498
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Julian Hyde commented on CALCITE-3809:
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There was a really unhelpful change in this commit. Previously
{{RexInterpreter}} had a list of expressions that it *cannot* handle (which
just included CAST); after this change, it has a list of expressions that it
*can* handle (which excludes important ones such as {{IS_NOT_NULL}}). As a
result, we have lost a lot of test coverage.
> RexSimplify simplifies nondeterministic function incorrectly
> ------------------------------------------------------------
>
> Key: CALCITE-3809
> URL: https://issues.apache.org/jira/browse/CALCITE-3809
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.21.0
> Reporter: Chunwei Lei
> Assignee: Chunwei Lei
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.23.0
>
> Time Spent: 5h 20m
> Remaining Estimate: 0h
>
> For example, {{rand() = rand()}} will be simplified to {{IS NOT
> NULL(rand())}}, which is wrong because {{rand() = rand()}} might be false
> while {{IS NOT NULL(rand())}} is always true.
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