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https://issues.apache.org/jira/browse/FLINK-40672?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated FLINK-40672:
-----------------------------------
Labels: pull-request-available (was: )
> Incorrect nullability for CAST from VARIANT
> -------------------------------------------
>
> Key: FLINK-40672
> URL: https://issues.apache.org/jira/browse/FLINK-40672
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API
> Reporter: dylanhz
> Priority: Major
> Labels: pull-request-available
>
> h3. Description
> A non-nullable VARIANT can contain a variant null. Casting it to a
> non-VARIANT type returns SQL NULL, but Flink incorrectly infers a NOT NULL
> result.
> For example:
> {code:sql}
> SELECT CAST(PARSE_JSON('null') AS INT);
> {code}
> This can cause runtime NOT NULL violations or incorrect optimization of {{IS
> NULL}} and {{COALESCE}}.
> Upstream Calcite already correctly makes casts from VARIANT to non-VARIANT
> types nullable. Flink's copied {{SqlCastFunction}} does not preserve this
> behavior.
> h3. Expected behavior
> Align with Calcite and consistently infer nullable results for casts from
> VARIANT to non-VARIANT types in both SQL and Table API.
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