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https://issues.apache.org/jira/browse/CALCITE-5944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17756710#comment-17756710
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Julian Hyde commented on CALCITE-5944:
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I agree with [~libenchao]. The summary of this case should be 'Add metadata for
Sample', and you should consider all kinds of metadata. For example, predicates
propagate through Sample unchanged.
> RelMdRowCount can return more accurate rowCount for Sample
> ----------------------------------------------------------
>
> Key: CALCITE-5944
> URL: https://issues.apache.org/jira/browse/CALCITE-5944
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Jiajun Xie
> Assignee: Jiajun Xie
> Priority: Minor
> Labels: pull-request-available
>
> For the sql
> {code:java}
> select * from emp tablesample system(20) {code}
> `mq.getRowCount(rel)` is null, but we can return `inputRowCount * 0.2`.
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