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https://issues.apache.org/jira/browse/CALCITE-4582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17334408#comment-17334408
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Chunwei Lei commented on CALCITE-4582:
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Makes sense.
> The distinct row count and population size should be 1 for deduced constant
> columns
> -----------------------------------------------------------------------------------
>
> Key: CALCITE-4582
> URL: https://issues.apache.org/jira/browse/CALCITE-4582
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Liya Fan
> Priority: Major
>
> As a follow-up issue for CALCITE-4511, we should support more scenarios for
> which the columns are deduced to have constant values, so they must have the
> distinct row count equal to 1.
> Some examples of such cases:
> {noformat}
> select one
> from ( select *, 1 as one from emp);
> select deptno
> from emp
> where deptno = 20;
> {noformat}
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