Object deepCopy in GroupBy Operator
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Key: HIVE-949
URL: https://issues.apache.org/jira/browse/HIVE-949
Project: Hadoop Hive
Issue Type: Improvement
Reporter: Ning Zhang
In GroupByOperator, objects are first deep copied and then check whether or not
the object is in the hash table (in hash-mode aggregation). In fact, object
deep copy could be very expensive (around 5% CPU time). A simple change could
be generate the object without deep copy through ObjectInspector and check its
existence in the hash table. If not exists, we call deep copy.
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