[jira] [Commented] (SPARK-13957) Support group by ordinal in SQL

["Xiao Li (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-13957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15198839#comment-15198839 ] 

Xiao Li commented on SPARK-13957:
---------------------------------

Sure, will do it. Thanks!

> Support group by ordinal in SQL
> -------------------------------
>
>                 Key: SPARK-13957
>                 URL: https://issues.apache.org/jira/browse/SPARK-13957
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Reynold Xin
>
> This is to support order by position in SQL, e.g.
> {noformat}
> select c1, c2, c3, sum(*) from tbl group by by 1, 3, c4
> {noformat}
> should be equivalent to
> {noformat}
> select c1, c2, c3, sum(*) from tbl order by c1, c3, c4
> {noformat}
> We only convert integer literals (not foldable expressions).
> For positions that are aggregate functions, an analysis exception should be thrown, e.g. in postgres;
> {noformat}
> rxin=# select 'one', 'two', count(*) from r1 group by 1, 3;
> ERROR:  aggregate functions are not allowed in GROUP BY
> LINE 1: select 'one', 'two', count(*) from r1 group by 1, 3;
>                              ^
> {noformat}
> This should be controlled by config option spark.sql.groupByOrdinal.



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