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Posted to dev@hive.apache.org by "Ning Zhang (JIRA)" <ji...@apache.org> on 2009/11/23 21:49:39 UTC

[jira] Created: (HIVE-950) avoiding unnecessary array allocation in joins

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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