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https://issues.apache.org/jira/browse/CALCITE-4218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17189669#comment-17189669
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Vladimir Sitnikov commented on CALCITE-4218:
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Ok, let me see what happens if I specify {{@Nullable}} for all the
metadata-like methods, including distribution ones. I just thought that
{{RelDistributions.ANY}} is exactly the same as {{null}}, and we could teach
{{RelMetadataQuery}} facade to make {{null -> ANY}} conversion, so the
resulting value is easier to use in Java.
> Clarify RelMetadataQuery#getDistribution 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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