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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/04/12 12:21:00 UTC
[jira] [Commented] (SPARK-35028) ANSI mode: disallow group by
aliases
[ https://issues.apache.org/jira/browse/SPARK-35028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17319418#comment-17319418 ]
Apache Spark commented on SPARK-35028:
--------------------------------------
User 'gengliangwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/32129
> ANSI mode: disallow group by aliases
> ------------------------------------
>
> Key: SPARK-35028
> URL: https://issues.apache.org/jira/browse/SPARK-35028
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Gengliang Wang
> Assignee: Gengliang Wang
> Priority: Major
>
> As per the ANSI SQL standard secion 7.12 <group by clause>:
> bq. Each <grouping column reference> shall unambiguously reference a column of the table resulting from the <from clause>. A column referenced in a <group by clause> is a grouping column.
> By forbidding it, we can avoid ambiguous SQL queries like:
> SELECT col + 1 as col FROM t GROUP BY col
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