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https://issues.apache.org/jira/browse/CALCITE-6149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17804500#comment-17804500
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Mihai Budiu commented on CALCITE-6149:
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Fixed by commit
https://github.com/apache/calcite/commit/7b97c4e4581094cc405d0f0fa4c16f462ef1166d
> ClickHouseSqlDialect should support cast to Nullable
> ----------------------------------------------------
>
> Key: CALCITE-6149
> URL: https://issues.apache.org/jira/browse/CALCITE-6149
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.36.0
> Reporter: ChenLuyang
> Priority: Minor
> Labels: dialect, pull-request-available
> Fix For: 1.37.0
>
>
> In ClickHouse, there is an issue with RelDataType of Nullable type when
> casting to a non-Nullable type. For example, {{SELECT CAST(NULL, 'Int32')}}
> will throw an error. In such cases, we should use {{SELECT CAST(NULL,
> 'Nullable(Int32)')}} instead.
>
> related error messages.
> DB::Exception: Cannot convert NULL value to non-Nullable type
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