wangmeng created HIVE-10971:
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Summary: count(*) with count(distinct) gives wrong results when
hive.groupby.skewindata=true
Key: HIVE-10971
URL: https://issues.apache.org/jira/browse/HIVE-10971
Project: Hive
Issue Type: Bug
Components: Hive
Affects Versions: 1.2.0
Reporter: wangmeng
Assignee: wangmeng
When hive.groupby.skewindata=true, the following query based on TPC-H gives
wrong results:
{code}
set hive.groupby.skewindata=true;
select l_returnflag, count(*), count(distinct l_linestatus)
from lineitem
group by l_returnflag
limit 10;
{code}
The query plan shows that it generates only one MapReduce job instead of two,
which is dictated by hive.groupby.skewindata=true.
The problem arises only when {noformat}count(*){noformat} and
{noformat}count(distinct){noformat} exist together.
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