[jira] [Updated] (CALCITE-4208) Improve metadata row count for Join

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-4208?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated CALCITE-4208:
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    Labels: pull-request-available  (was: )

> Improve metadata row count for Join
> -----------------------------------
>
>                 Key: CALCITE-4208
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4208
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Ruben Q L
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Currently, the default metadata row count for join {{RelMdRowCount#getRowCount(Join rel, RelMetadataQuery mq)}} relies on {{RelMdUtil.getJoinRowCount}}. This method has several issues:
>  - In case of ANTI join, it returns the same estimation as a SEMI join
>  - In other cases (INNER, LEFT, RIGHT, FULL), it returns always the same formula:
>  {{leftRowCount * rightRowCount * mq.getSelectivity(join, condition)}}
>  which seems valid for an INNER join, but not for LEFT / RIGHT / FULL.



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