Xuefu Zhang created HIVE-5992:
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Summary: Hive inconsistently converts timestamp in AVG and SUM
UDAF's
Key: HIVE-5992
URL: https://issues.apache.org/jira/browse/HIVE-5992
Project: Hive
Issue Type: Bug
Affects Versions: 0.12.0
Reporter: Xuefu Zhang
Assignee: Xuefu Zhang
{code}
hive> select t, sum(t), count(*), sum(t)/count(*), avg(t) from ts group by t;
...
OK
1977-03-15 12:34:22.345678 227306062 1 227306062
2.27306062345678E8
{code}
As it can be seen, timestamp value (1977-03-15 12:34:22.345678) is converted
with fractional part ignored in sum, while preserved in avg. As a further
result, sum()/count() is not equivalent to avg.
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