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https://issues.apache.org/jira/browse/CALCITE-1130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15185086#comment-15185086
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Michael Mior commented on CALCITE-1130:
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Yup! This seems to fix things. I still have a couple other issues to sort
through with [CALCITE-1104|https://issues.apache.org/jira/browse/CALCITE-1104],
but this seems to work as expected. Thanks [~amargoor]!
> Add unary operator support for IS_NULL and IS_NOT_NULL to
> RexImplicationChecker
> -------------------------------------------------------------------------------
>
> Key: CALCITE-1130
> URL: https://issues.apache.org/jira/browse/CALCITE-1130
> Project: Calcite
> Issue Type: Improvement
> Reporter: Amogh Margoor
> Assignee: Julian Hyde
>
> Currently we support only SQL Comparison operators (SqlKind.COMPARE) for
> checking if one predicate implies another using RexImplicationChecker.
> We would like to extend it for couple of Unary operators based on user
> request ( CALCITE-1104): IS_NULL and IS_NOT_NULL
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