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https://issues.apache.org/jira/browse/CALCITE-2929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795766#comment-16795766
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Danny Chan commented on CALCITE-2929:
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[~kgyrtkirk] Now Calcite does not support implicit type cast, and it's strict
type for node. So a cast(val1) never expects to return null if val1 is not
null. So for now, we can think it's Strong for nullability.
> Simplification of IS NULL checks are incorrectly assuming that CAST-s are
> possible
> ----------------------------------------------------------------------------------
>
> Key: CALCITE-2929
> URL: https://issues.apache.org/jira/browse/CALCITE-2929
> Project: Calcite
> Issue Type: Bug
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
>
> Example:
> {code}
> with ax(s) as (values ('xxx'),(cast(null as character varying)))
> select cast(s as int) IS NULL from ax;
> {code}
> returns a result set; which evaluates
> however 'xxx' is not a valid integer; so an error should be recieved instead
> Another class of almost the same issue:
> {code}
> select cast('xxx' as int) IS NULL;
> {code}
> is also problematic; in that case the not nullability is deduced from the
> fact that the literal's type is not nullable
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