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https://issues.apache.org/jira/browse/FLINK-19891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rui Li updated FLINK-19891:
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Description: Otherwise, calling a function expecting a not null boolean
argument will fail with argument type mismatch.
> ScalarOperatorGens should generate a not-null type for IS NULL and IS NOT NULL
> ------------------------------------------------------------------------------
>
> Key: FLINK-19891
> URL: https://issues.apache.org/jira/browse/FLINK-19891
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Reporter: Rui Li
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.12.0
>
>
> Otherwise, calling a function expecting a not null boolean argument will fail
> with argument type mismatch.
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