[jira] [Assigned] (SPARK-38162) Optimize one row plan in normal and AQE Optimizer

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

     [ https://issues.apache.org/jira/browse/SPARK-38162?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yuming Wang reassigned SPARK-38162:
-----------------------------------

    Assignee: XiDuo You

> Optimize one row plan in normal and AQE Optimizer
> -------------------------------------------------
>
>                 Key: SPARK-38162
>                 URL: https://issues.apache.org/jira/browse/SPARK-38162
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 3.3.0
>            Reporter: XiDuo You
>            Assignee: XiDuo You
>            Priority: Major
>             Fix For: 3.3.0
>
>
> Optimize the plan if its max row is equal to or less than 1 in these cases:
> - if the child of sort max rows less than or equal to 1, remove the sort
> - if the child of local sort max rows per partition less than or equal to 1, remove the local sort
> - if the child of aggregate max rows less than or equal to 1 and it's grouping only (include the rewritten distinct plan), remove the aggregate
> - if the child of aggregate max rows less than or equal to 1, set distinct to false in all aggregate expression



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