[jira] [Comment Edited] (DRILL-2330) Add support for nested aggregate expressions

["Aman Sinha (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-2330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14570024#comment-14570024 ] 

Aman Sinha edited comment on DRILL-2330 at 6/3/15 12:06 AM:
------------------------------------------------------------

Your example in the description is not valid.  Nested aggregate functions are only allowed if they are nested within a window aggregate, not one aggregate within another.   For instance, the following is valid syntax although it is not currently supported by Calcite/Drill: 
  {code}
  select avg(sum(a1)) over (partition by b1) from tt1 group by b1;
  {code} 


was (Author: amansinha100):
Your example in the description is not valid.  Nested aggregate functions are only allowed if they are nested within a window aggregate, not one aggregate within another.   For instance, the following is valid: 
  {code}
  select avg(sum(a1)) over (partition by b1) from tt1 group by b1;
  {code} 

> Add support for nested aggregate expressions
> --------------------------------------------
>
>                 Key: DRILL-2330
>                 URL: https://issues.apache.org/jira/browse/DRILL-2330
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Query Planning & Optimization
>    Affects Versions: 0.8.0
>            Reporter: Abhishek Girish
>            Assignee: Jinfeng Ni
>             Fix For: Future
>
>         Attachments: drillbit.log
>
>
> Aggregate expressions currently cannot be nested. 
> *The following query fails to validate:*
> {code:sql}
> select avg(sum(i_item_sk)) from item;
> {code}
> Error:
> Query failed: SqlValidatorException: Aggregate expressions cannot be nested
> Log attached. 
> Reference: TPCDS queries (20, 63, 98, ...) fail to execute.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)