[jira] [Updated] (SPARK-32542) add a batch for optimizing logicalPlan

["karl wang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-32542?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

karl wang updated SPARK-32542:
------------------------------
    Description: 
Split an expand into several smallExpand,which contains the Specified number of projections.
For instance,like this sql.select a,b,c,d,count(1) from table1 group by a,b,c,d with cube. It can expand 2^4 times of original data size.
Now we specify the spark.sql.optimizer.projections.size=4.The Expand will be split into 2^4/4 smallExpand.It can reduce the shuffle pressure and improve performance in multidimensional analysis when data is huge.

> add a batch for optimizing logicalPlan
> --------------------------------------
>
>                 Key: SPARK-32542
>                 URL: https://issues.apache.org/jira/browse/SPARK-32542
>             Project: Spark
>          Issue Type: Improvement
>          Components: Optimizer
>    Affects Versions: 3.0.0
>            Reporter: karl wang
>            Priority: Minor
>             Fix For: 3.0.0
>
>
> Split an expand into several smallExpand,which contains the Specified number of projections.
> For instance,like this sql.select a,b,c,d,count(1) from table1 group by a,b,c,d with cube. It can expand 2^4 times of original data size.
> Now we specify the spark.sql.optimizer.projections.size=4.The Expand will be split into 2^4/4 smallExpand.It can reduce the shuffle pressure and improve performance in multidimensional analysis when data is huge.



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