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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/07/15 08:43:00 UTC

[jira] [Commented] (SPARK-36155) Eliminate join base uniqueness

    [ https://issues.apache.org/jira/browse/SPARK-36155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17381174#comment-17381174 ] 

Apache Spark commented on SPARK-36155:
--------------------------------------

User 'wangyum' has created a pull request for this issue:
https://github.com/apache/spark/pull/33361

> Eliminate join base uniqueness
> ------------------------------
>
>                 Key: SPARK-36155
>                 URL: https://issues.apache.org/jira/browse/SPARK-36155
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.2.0
>            Reporter: Yuming Wang
>            Priority: Major
>
> For example:
> SELECT f1 FROM t1 LEFT JOIN (SELECT DISTINCT id FROM t2) t21 ON t1.id = t21.id  ==>
> SELECT f1 FROM t1



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