[IMPALA-1453] GROUP BY on STRING column produces inconsistent results

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 2.0
• Fix Version/s: Impala 2.1
• Labels: correctness
• Assignee: Henry Robinson
• Reporter: Henry Robinson
• Created: 05/Nov/14 19:22
• Updated: 14/May/15 21:52
• Resolved: 24/Nov/14 05:58

Description

The following query produces inconsistent results on a STRING column:

SELECT string_col FROM table GROUP BY string_col;

can be reproduced on http://mdonsky-1.ent.cloudera.com:8888/impala/#query
with the following query:

SELECT fname FROM employees GROUP BY fname;