[jira] [Resolved] (SPARK-19035) rand() function in case when cause failed

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-19035?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon resolved SPARK-19035.
----------------------------------
    Resolution: Incomplete

> rand() function in case when cause failed
> -----------------------------------------
>
>                 Key: SPARK-19035
>                 URL: https://issues.apache.org/jira/browse/SPARK-19035
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.0.0, 2.0.1, 2.0.2
>            Reporter: Feng Yuan
>            Priority: Major
>              Labels: bulk-closed
>
> *In this case:*
>                select 
>                        case when a=1 then 1 else concat(a,cast(rand() as string)) end b,count(1) 
>                from 
>                        yuanfeng1_a 
>                group by 
>                        case when a=1 then 1 else concat(a,cast(rand() as string)) end;
> *Throw error:*
> Error in query: expression 'yuanfeng1_a.`a`' is neither present in the group by, nor is it an aggregate function. Add to group by or wrap in first() (or first_value) if you don't care which value you get.;;
> Aggregate [CASE WHEN (a#2075 = 1) THEN cast(1 as string) ELSE concat(cast(a#2075 as string), cast(rand(519367429988179997) as string)) END], [CASE WHEN (a#2075 = 1) THEN cast(1 as string) ELSE concat(cast(a#2075 as string), cast(rand(8090243936131101651) as string)) END AS b#2074]
> +- MetastoreRelation default, yuanfeng1_a
> select case when a=1 then 1 else rand() end b,count(1) from yuanfeng1_a group by case when a=1 then rand() end also output this
> *Notice*:
> If replace rand() as 1,it work.
> A simpler way to reproduce this bug: `SELECT a + rand() FROM t GROUP BY a + rand()`.



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