Join Operator should directly emit when it sees a row from the last join operand
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Key: HIVE-409
URL: https://issues.apache.org/jira/browse/HIVE-409
Project: Hadoop Hive
Issue Type: Improvement
Reporter: Zheng Shao
Currently we are caching rows till joinEmitInterval. This is not necessary -
and if we remove it, we can reduce the number of Object copies a lot
(especially in the case we are joining a dimension table with a fact table)
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