avoiding unnecessary array allocation in joins
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Key: HIVE-950
URL: https://issues.apache.org/jira/browse/HIVE-950
Project: Hadoop Hive
Issue Type: Improvement
Reporter: Ning Zhang
In CommonJoinOperator.java, resNull array is created for each getObject() call.
This is very expensive given a large number of getObject() is called. In fact,
most of array allocations can be omitted or reused given the fact that the keys
are already matched. This will significantly reduce the work for garbage
collector.
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