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https://issues.apache.org/jira/browse/CALCITE-4756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17407005#comment-17407005
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duan xiong commented on CALCITE-4756:
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[~jhyde]. Hi. This issue blocked others, So If you have more time, Please
review this first, Thanks very much.
> When subquery include NULL value, Calcite should return the right result
> ------------------------------------------------------------------------
>
> Key: CALCITE-4756
> URL: https://issues.apache.org/jira/browse/CALCITE-4756
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.27.0
> Reporter: duan xiong
> Assignee: duan xiong
> Priority: Major
>
> When I try to design some unit tests for CALCITE-4742. I found Calcite can't
> handle NULL very well in some subquery. For example:
> {code:java}
> select 1 in (null,1);
> select 1 <> some(null);{code}
> This SQL should return NULL、UNKNOWN、TRUE、FALSE. But throw NPE.
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