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https://issues.apache.org/jira/browse/HIVE-12474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15014794#comment-15014794
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Dongwook Kwon commented on HIVE-12474:
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As Prasad Mujumdar pointed out, it should be documented, if this change was
intentional.
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+SortBy
> ORDER BY should handle column refs in parantheses
> -------------------------------------------------
>
> Key: HIVE-12474
> URL: https://issues.apache.org/jira/browse/HIVE-12474
> Project: Hive
> Issue Type: Bug
> Components: Parser
> Affects Versions: 1.0.0, 1.2.1
> Reporter: Aaron Tokhy
> Assignee: Pengcheng Xiong
> Priority: Minor
>
> CREATE TABLE test(a INT, b INT, c INT)
> COMMENT 'This is a test table';
> hive>
> select lead(c) over (order by (a,b)) from test limit 10;
> FAILED: ParseException line 1:31 missing ) at ',' near ')'
> line 1:34 missing EOF at ')' near ')'
> hive>
> select lead(c) over (order by a,b) from test limit 10;
> - Works as expected.
> It appears that 'cluster by'/'sort by'/'distribute by'/'partition by' allows
> this:
> https://github.com/apache/hive/blob/release-1.2.1/ql/src/java/org/apache/hadoop/hive/ql/parse/IdentifiersParser.g#L129
> For example, this syntax is still valid:
> select lead(c) over (sort by (a,b)) from test limit 10;
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