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From "Dominic Ricard (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (SPARK-14666) Using DISTINCT on a UDF (like CONCAT) is not supported
Date Fri, 15 Apr 2016 19:33:25 GMT

    [ https://issues.apache.org/jira/browse/SPARK-14666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15243455#comment-15243455
] 

Dominic Ricard edited comment on SPARK-14666 at 4/15/16 7:33 PM:
-----------------------------------------------------------------

It appears that the order by clause is expecting the column name. The proper query looks like
this:

{noformat}
select
  distinct concat(column_1, ' : ', column_2) as `column1`
from
  table
order by
  `column1`;
{noformat}

Why isn't concat(column_1, ' : ', column2) converted to the _c0 alias in order by when used
in conjunction with distinct?


was (Author: dricard):
It appears that the order by clause is expecting the column name. The proper query looks like
this:

{noformat}
select
  distinct concat(column_1, ' : ', column_2) as `column1`
from
  table
order by
  `column1`;
{noformat}

> Using DISTINCT on a UDF (like CONCAT) is not supported
> ------------------------------------------------------
>
>                 Key: SPARK-14666
>                 URL: https://issues.apache.org/jira/browse/SPARK-14666
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.6.1
>            Reporter: Dominic Ricard
>            Priority: Minor
>
> The following query fails with:
> {noformat}
> Java::JavaSql::SQLException: org.apache.spark.sql.AnalysisException: cannot resolve 'column_1'
given input columns: [_c0]; line # pos ##
> {noformat}
> Query:
> {noformat}
> select
>   distinct concat(column_1, ' : ', column_2)
> from
>   table
> order by
>   concat(column_1, ' : ', column_2);
> {noformat}



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