[HIVE-4540] JOIN-GRP BY-DISTINCT fails with NPE when mapjoin.mapreduce=true

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.11.0
• Fix Version/s: 0.12.0
• Assignee: Gunther Hagleitner
• Reporter: Gunther Hagleitner
• Created: 10/May/13 18:33
• Updated: 15/Oct/13 23:31
• Resolved: 28/May/13 00:57

Description

If the mapjoin.mapreduce optimization kicks in on a query of this form:

select count(distinct a.v) 
from a join b on (a.k = b.k)
group by a.g

The planer will NPE in the metadataonly optimizer.