Szehon Ho created HIVE-20153:
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Summary: Count and Sum UDF consume more memory in Hive 2+
Key: HIVE-20153
URL: https://issues.apache.org/jira/browse/HIVE-20153
Project: Hive
Issue Type: Bug
Components: UDF
Affects Versions: 2.3.2
Reporter: Szehon Ho
While playing with Hive2, we noticed that queries with a lot of count() and
sum() aggregations run out of memory on Hadoop side much faster than in Hive1.
Taking heap dump, we see one of the main culprit is the field 'uniqueObjects'
in GeneraicUDAFSum and GenericUDAFCount, which was added to support Window
functions.
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