[jira] [Commented] (SPARK-18863) Output non-aggregate expressions without GROUP BY in a subquery does not yield an error

["Nattavut Sutyanyong (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-18863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15791310#comment-15791310 ] 

Nattavut Sutyanyong commented on SPARK-18863:
---------------------------------------------

My further investigation concludes this problem reported by [~smilegator] is different from the one in SPARK-16161 and the one reported by me in subquery/in-subquery/in-group-by.sql TC 01.12. I have opened SPARK-19047 to track the last problem.

> Output non-aggregate expressions without GROUP BY in a subquery does not yield an error 
> ----------------------------------------------------------------------------------------
>
>                 Key: SPARK-18863
>                 URL: https://issues.apache.org/jira/browse/SPARK-18863
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.0.0
>            Reporter: Nattavut Sutyanyong
>
> [~smilegator] has found that the following query does not raise a syntax error (note the GROUP BY clause is commented out):
> {code:sql}
> SELECT pk, cv
> FROM   p, c
> WHERE  p.pk = c.ck
> AND    c.cv = (SELECT max(avg)
>                FROM   (SELECT   c1.cv, avg(c1.cv) avg
>                        FROM     c c1
>                        WHERE    c1.ck = p.pk
> --                       GROUP BY c1.cv
>                       ))
> {code}
> There could be multiple values of {{c1.cv}} for each value of {{avg(c1.cv)}}.



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