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https://issues.apache.org/jira/browse/CALCITE-2840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16766959#comment-16766959
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Zoltan Haindrich commented on CALCITE-2840:
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right now AND/OR simplification is quite defensive; they set UnknownAs.UNKNOWN
during all operand simplification
> Simplification should use more specific UnknownAs modes during simplification
> -----------------------------------------------------------------------------
>
> Key: CALCITE-2840
> URL: https://issues.apache.org/jira/browse/CALCITE-2840
> Project: Calcite
> Issue Type: Improvement
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
>
> Some parts of this was already working in 1.17 ; but 1.18 turned out to be a
> more conservative in this sense.
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