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https://issues.apache.org/jira/browse/DRILL-2914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14520773#comment-14520773
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Venki Korukanti commented on DRILL-2914:
----------------------------------------
This seems like a planning or '\*' handling issue. We get the group by expr as
"\*" in HashAgg which materializes to null constant. Projecting the field
*gender* from inner query returns the correct result.
{code}
select gender2.gender as c0 from (SELECT gender FROM
dfs.`/Users/hadoop/Downloads/customer`) as gender2 group by gender2.gender
order by gender2.gender ASC NULLS LAST;
{code}
> regression: Mondrian query534.q, drill give wrong result
> --------------------------------------------------------
>
> Key: DRILL-2914
> URL: https://issues.apache.org/jira/browse/DRILL-2914
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Relational Operators
> Affects Versions: 0.9.0
> Reporter: Chun Chang
> Assignee: Chris Westin
> Priority: Critical
> Attachments: customer
>
>
> #Wed Apr 29 14:39:22 EDT 2015
> git.commit.id.abbrev=f5b0f49
> Running mondrian tests and noticed several regressions. This one is related
> to group by with select * subquery.
> {code}
> SELECT gender2.gender AS c0
> FROM (SELECT *
> FROM customer) AS gender2
> GROUP BY gender2.gender
> ORDER BY gender2.gender ASC nulls last;
> {code}
> Correct result from postgres:
> {code}
> foodmart=# select gender2.gender as c0 from (SELECT * FROM customer) as
> gender2 group by gender2.gender order by gender2.gender ASC NULLS LAST;
> c0
> ----
> F
> M
> (2 rows)
> {code}
> Wrong result from drill:
> {code}
> 0: jdbc:drill:schema=dfs.drillTestDirAdvanced> select gender2.gender as c0
> from (SELECT * FROM customer) as gender2 group by gender2.gender order by
> gender2.gender ASC NULLS LAST;
> +------------+
> | c0 |
> +------------+
> | null |
> +------------+
> {code}
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