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Posted to issues@hive.apache.org by "mahesh kumar behera (Jira)" <ji...@apache.org> on 2020/08/05 03:27:00 UTC

[jira] [Updated] (HIVE-23991) Support isAlwaysTrue for Anti Join

     [ https://issues.apache.org/jira/browse/HIVE-23991?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

mahesh kumar behera updated HIVE-23991:
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    Description: The current anti join conversion does not support join condition which is always true. The queries like select * from tbl t1 where not exists (select 1 from t2) is not converted to anti join.  (was: The current anti join conversion does not support direct conversion of not-exists to anti join. The not exists sub query is converted first to left out join and then its converted to anti join. This may cause some of the optimization rule to be skipped.

 )

> Support isAlwaysTrue for Anti Join
> ----------------------------------
>
>                 Key: HIVE-23991
>                 URL: https://issues.apache.org/jira/browse/HIVE-23991
>             Project: Hive
>          Issue Type: Bug
>            Reporter: mahesh kumar behera
>            Assignee: mahesh kumar behera
>            Priority: Major
>
> The current anti join conversion does not support join condition which is always true. The queries like select * from tbl t1 where not exists (select 1 from t2) is not converted to anti join.



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