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https://issues.apache.org/jira/browse/CALCITE-3803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17038434#comment-17038434
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Zoltan Haindrich commented on CALCITE-3803:
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oh...yes; you are right - we can do much better with a check for nullability.
> Enhance RexSimplify to simplify 'a>1 or (a<3 and b)' to 'a>1 or b' if column
> a is not nullable
> ----------------------------------------------------------------------------------------------
>
> Key: CALCITE-3803
> URL: https://issues.apache.org/jira/browse/CALCITE-3803
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Chunwei Lei
> Assignee: Chunwei Lei
> Priority: Major
>
> For {{a>1 or (a<3 and b)}}, with short-circuit, we know {{a<=1}} if {{a>1}}
> is false when column a is not nullable. Then {{(a<3 and b) can be simplified
> to b}}. Thus, {{a>1 or (a<3 and b)is simplified to a>1 or b.}}
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