[ARROW-7478] [Rust] [DataFusion] Group by expression ignored unless paired with aggregate expression

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.16.0
• Component/s: Rust, Rust - DataFusion
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/23744
• Assignee: Kyle McCarthy
• Reporter: Kyle McCarthy
• Created: 30/Dec/19 19:42
• Updated: 11/Jan/23 07:54
• Resolved: 03/Jan/20 07:53

Description

GROUP BY expressions are ignored unless the query also contains an aggregate expression.

To reproduce you can execute the following query on the aggregate_test_100 data set.

SELECT c2 FROM aggregate_test_100 GROUP BY c2

Expected:

1
2
3
4
5

Actual:

2
5
...98 more rows...

 

The order of the expected isn't necessarily correct since the query doesn't contain an ORDER BY expression.

Issue Links

• links to: GitHub Pull Request #6115