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https://issues.apache.org/jira/browse/CALCITE-2991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16815888#comment-16815888
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Haisheng Yuan commented on CALCITE-2991:
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I see your concern. For count(*), it will indeed change the semantics.
> getMaxRowCount should return rowcount 1 for an aggregate with constant keys
> ---------------------------------------------------------------------------
>
> Key: CALCITE-2991
> URL: https://issues.apache.org/jira/browse/CALCITE-2991
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Aggregate with constant keys are guaranteed to produce at most one row
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