Gunther Hagleitner created HIVE-4540:
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Summary: JOIN-GRP BY-DISTINCT fails with NPE when
mapjoin.mapreduce=true
Key: HIVE-4540
URL: https://issues.apache.org/jira/browse/HIVE-4540
Project: Hive
Issue Type: Bug
Reporter: Gunther Hagleitner
Assignee: Gunther Hagleitner
If the mapjoin.mapreduce optimization kicks in on a query of this form:
{noformat}
select count(distinct a.v)
from a join b on (a.k = b.k)
group by a.g
{noformat}
The planer will NPE in the metadataonly optimizer.
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