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https://issues.apache.org/jira/browse/CALCITE-5944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17757171#comment-17757171
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Jiajun Xie commented on CALCITE-5944:
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Initially, I planned to discuss separately, so I create different Jira ticket.
But now the Jira include https://issues.apache.org/jira/browse/CALCITE-5943, so
I closed it.
> Add metadata 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`.
>
> Other metadata also need to to implemented.
> * RelMdColumnOrigins
> * RelMdExpressionLineage
> * RelMdPredicates
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