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https://issues.apache.org/jira/browse/CALCITE-4218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17189648#comment-17189648
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Vladimir Sitnikov commented on CALCITE-4218:
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I mean methods like
{{org.apache.calcite.rel.metadata.RelMetadataQuery#getDistribution}} and
methods like
{{org.apache.calcite.rel.metadata.RelMdDistribution#distribution(org.apache.calcite.rel.core.TableScan,
org.apache.calcite.rel.metadata.RelMetadataQuery)}}
I know there was a fix recently by [~rkondakov]:
https://issues.apache.org/jira/browse/CALCITE-3969 which goes for ANY as a
default distribution.
If you think we should keep ANY vs null distinction for getDistribution, then
we should probably revert CALCITE-3969 or do something with it.
> 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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