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https://issues.apache.org/jira/browse/CALCITE-5943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17756686#comment-17756686
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Jiajun Xie commented on CALCITE-5943:
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[~libenchao] No, this is discussion about `Selectivity`.
I can't found anything about `Selectivity` in ANSI SQL 2011.
Here is concept in Oracle:
https://docs.oracle.com/cd/B10500_01/appdev.920/a96595/dci08opt.htm
> RelMdSelectivity can return more precise selectivity for Sample
> ---------------------------------------------------------------
>
> Key: CALCITE-5943
> URL: https://issues.apache.org/jira/browse/CALCITE-5943
> Project: Calcite
> Issue Type: Improvement
> Reporter: Jiajun Xie
> Assignee: Jiajun Xie
> Priority: Minor
>
> For the SQL
> {code:java}
> select * from emp tablesample bernoulli(50) {code}
> selectivity is 1.0, maybe 0.5 will be better.
>
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