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https://issues.apache.org/jira/browse/CALCITE-1130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-1130.
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Resolution: Fixed
Fix Version/s: 1.7.0
Fixed in http://git-wip-us.apache.org/repos/asf/calcite/commit/82c3b293. Thanks
for the PR, [~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
> Fix For: 1.7.0
>
>
> 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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