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https://issues.apache.org/jira/browse/CALCITE-3809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17252581#comment-17252581
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Chunwei Lei commented on CALCITE-3809:
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Actually, RexInterpreter already has a white list of expressions[1] that it can
handle before this commit. I found that in this commit IS_NULL and IS NOT NULL
were not included as supported functions, which I think is not expected.
[1]https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/rex/RexInterpreter.java#L139
> 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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