[jira] [Assigned] (SPARK-34808) Removes outer join if it only has distinct on streamed side

["Yuming Wang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-34808?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yuming Wang reassigned SPARK-34808:
-----------------------------------

    Assignee:     (was: Yuming Wang)

> Removes outer join if it only has distinct on streamed side
> -----------------------------------------------------------
>
>                 Key: SPARK-34808
>                 URL: https://issues.apache.org/jira/browse/SPARK-34808
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.2.0
>            Reporter: Yuming Wang
>            Priority: Major
>
> For example:
> {code:scala}
> spark.range(200L).selectExpr("id AS a").createTempView("t1")
> spark.range(300L).selectExpr("id AS b").createTempView("t2")
> spark.sql("SELECT DISTINCT a FROM t1 LEFT JOIN t2 ON a = b").explain(true)
> {code}
> Current optimized plan:
> {noformat}
> == Optimized Logical Plan ==
> Aggregate [a#2L], [a#2L]
> +- Project [a#2L]
>    +- Join LeftOuter, (a#2L = b#6L)
>       :- Project [id#0L AS a#2L]
>       :  +- Range (0, 200, step=1, splits=Some(2))
>       +- Project [id#4L AS b#6L]
>          +- Range (0, 300, step=1, splits=Some(2))
> {noformat}
> Expected optimized plan:
> {noformat}
> == Optimized Logical Plan ==
> Aggregate [a#2L], [a#2L]
> +- Project [id#0L AS a#2L]
>    +- Range (0, 200, step=1, splits=Some(2))
> {noformat}
>  



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