[jira] [Assigned] (SPARK-34396) Add a new build-in function delegate

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

     [ https://issues.apache.org/jira/browse/SPARK-34396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-34396:
------------------------------------

    Assignee:     (was: Apache Spark)

> Add a new build-in function delegate
> ------------------------------------
>
>                 Key: SPARK-34396
>                 URL: https://issues.apache.org/jira/browse/SPARK-34396
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.2.0
>            Reporter: ulysses you
>            Priority: Minor
>
> Delegate is just like a big box that can include some other expressions. It will execute all of children and return the last child result as its result.
>  
> The origin idea is from debug. Debug SQL is hard since SQL is always quite long and complex. This new function can help debug with inject some help functions, e.g., `println, sleep, raise_error`.
>  
> Two usage examples:
> {code:java}
> -- raw sql
> INSERT INTO TABLE t1
> SELECT coalesce(c1, c2) as c FROM t2
>  
> -- print the column data
> INSERT INTO TABLE t1
> SELECT delegate(
> java_method('scala.Console', 'println', concat('c1: ', c1, ', c2: ', c2)),
> coalesce(c1, c2)
> ) as c FROM t2{code}
>  
> {code:java}
> -- raw sql
> SELECT if(spark_partition_id() = 1, c1, raise_error('test error')) FROM t2
>  
> -- add a sleep time before throw error
> SELECT if(spark_partition_id() = 1, c1, delegate(
> java_method('java.lang.Thread', 'sleep', 3000l),
> raise_error('test error')
> )) FROM t2{code}
>  



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