[jira] [Commented] (SPARK-39397) Relax AliasAwareOutputExpression to support alias with expression

["Apache Spark (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-39397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17550868#comment-17550868 ] 

Apache Spark commented on SPARK-39397:
--------------------------------------

User 'ulysses-you' has created a pull request for this issue:
https://github.com/apache/spark/pull/36785

> Relax AliasAwareOutputExpression to support alias with expression
> -----------------------------------------------------------------
>
>                 Key: SPARK-39397
>                 URL: https://issues.apache.org/jira/browse/SPARK-39397
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.4.0
>            Reporter: XiDuo You
>            Priority: Major
>
> We will pull out complex join keys from grouping expressions, so the project can hold a alias with expression. Unfortunately we may lose the output partitioning since the current AliasAwareOutputExpression only support preserve the alias with attribute.
> For example, the follow query will introduce three exchanges instead of two.
> {code:java}
> SELECT c1 + 1, count(*)
> FROM t1
> JOIN t2 ON c1 + 1 = c2
> GROUP BY c1 + 1{code}



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