[jira] [Assigned] (SPARK-36478) Removes outer join if all grouping and aggregate expressions are from the streamed side

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

     [ https://issues.apache.org/jira/browse/SPARK-36478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-36478:
------------------------------------

    Assignee: Apache Spark

> Removes outer join if all grouping and aggregate expressions are from the streamed side
> ---------------------------------------------------------------------------------------
>
>                 Key: SPARK-36478
>                 URL: https://issues.apache.org/jira/browse/SPARK-36478
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.2.0
>            Reporter: Wan Kun
>            Assignee: Apache Spark
>            Priority: Minor
>
> Removes outer join if all grouping and aggregate expressions are from the streamed side.
> For example:
> {code:java}
> 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:
> {code:java}
> == Optimized Logical Plan ==
> Aggregate [b#3L], [b#3L, max(c#4L) AS c#20L]
> +- Project [b#3L, c#4L]
>    +- Join LeftOuter, (a#2L = a#10L)
>       :- Project [id#0L AS a#2L, id#0L AS b#3L, id#0L AS c#4L]
>       :  +- Range (0, 200, step=1, splits=Some(1))
>       +- Project [id#8L AS a#10L]
>          +- Range (0, 300, step=1, splits=Some(1))
> {code}
> Expected optimized plan:
> {code:java}
> == Optimized Logical Plan ==
> Aggregate [b#277L], [b#277L, max(c#278L) AS c#290L]
> +- Project [id#274L AS b#277L, id#274L AS c#278L]
>    +- Range (0, 200, step=1, splits=Some(2))
> {code}



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