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https://issues.apache.org/jira/browse/CALCITE-4218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17189640#comment-17189640
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Julian Hyde commented on CALCITE-4218:
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You can't make a class non-nullable. I guess you mean a particular method.
Metadata methods generally return null to mean 'not known'.
> Clarify RelMetadataQuery#RelDistribution nullability
> ----------------------------------------------------
>
> Key: CALCITE-4218
> URL: https://issues.apache.org/jira/browse/CALCITE-4218
> Project: Calcite
> Issue Type: Sub-task
> Components: core
> Affects Versions: 1.25.0
> Reporter: Vladimir Sitnikov
> Priority: Major
>
> It looks like {{null}} is the same as {{RelDistributions.ANY}}, so we might
> want to make {{RelDistribution}} non-nullable.
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