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https://issues.apache.org/jira/browse/DRILL-4805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15395012#comment-15395012
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Khurram Faraaz commented on DRILL-4805:
---------------------------------------
Yes, we should have uncovered this earlier. This issue is not a result of
changes made for DRILL-2330.
> COUNT(*) over window and group by partitioning column results in validation
> error
> ---------------------------------------------------------------------------------
>
> Key: DRILL-4805
> URL: https://issues.apache.org/jira/browse/DRILL-4805
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Affects Versions: 1.8.0
> Environment: 4 node cluster
> Reporter: Khurram Faraaz
> Labels: window_function
>
> COUNT(*) over window and group by partitioning column results in validation
> error.
> MapR Drill 1.8.0 commit ID : 34ca63ba
> {noformat}
> 0: jdbc:drill:schema=dfs.tmp> SELECT COUNT(*) OVER ( PARTITION BY c2 ORDER BY
> c2 ) FROM `tblWnulls.parquet` group by c2;
> Error: VALIDATION ERROR: At line 1, column 14: Expression '*' is not being
> grouped
> SQL Query null
> [Error Id: 44e03ee7-4c86-4809-90e7-5eaeb634691d on centos-01.qa.lab:31010]
> (state=,code=0)
> {noformat}
> Postgres returns the COUNT for the same query and same data.
> {noformat}
> postgres=# SELECT COUNT(*) OVER ( PARTITION BY c2 ORDER BY c2 ) FROM t222
> group by c2;
> count
> -------
> 1
> 1
> 1
> 1
> 1
> 1
> (6 rows)
> {noformat}
> Interestingly, when we do a nested COUNT(COUNT(*)) over the window, Drill
> does return the count.
> {noformat}
> 0: jdbc:drill:schema=dfs.tmp> SELECT COUNT(COUNT(*)) OVER ( PARTITION BY c2
> ORDER BY c2 ) FROM `tblWnulls.parquet` group by c2;
> +---------+
> | EXPR$0 |
> +---------+
> | 1 |
> | 1 |
> | 1 |
> | 1 |
> | 1 |
> | 1 |
> +---------+
> 6 rows selected (0.22 seconds)
> {noformat}
> Also without the GROUP BY c2, and with column c2 in the project Drill returns
> results.
> {noformat}
> 0: jdbc:drill:schema=dfs.tmp> SELECT COUNT(*) OVER ( PARTITION BY c2 ORDER BY
> c2 ), c2 FROM `tblWnulls.parquet`;
> +---------+-------+
> | EXPR$0 | c2 |
> +---------+-------+
> | 7 | a |
> | 7 | a |
> | 7 | a |
> | 7 | a |
> | 7 | a |
> | 7 | a |
> | 7 | a |
> | 4 | b |
> | 4 | b |
> | 4 | b |
> | 4 | b |
> | 7 | c |
> | 7 | c |
> | 7 | c |
> | 7 | c |
> | 7 | c |
> | 7 | c |
> | 7 | c |
> | 6 | d |
> | 6 | d |
> | 6 | d |
> | 6 | d |
> | 6 | d |
> | 6 | d |
> | 2 | e |
> | 2 | e |
> | 4 | null |
> | 4 | null |
> | 4 | null |
> | 4 | null |
> +---------+-------+
> 30 rows selected (0.172 seconds)
> {noformat}
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