Moving inputFileChanged() from ExecMapper to where it is needed
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Key: HIVE-1348
URL: https://issues.apache.org/jira/browse/HIVE-1348
Project: Hadoop Hive
Issue Type: Improvement
Reporter: Ning Zhang
Assignee: He Yongqiang
inputFileChanged() is only needed for Bucketed sort merge map join. It should
not be put in ExecMapper.map() where all code paths will hit this function.
This function is quite expensive since JobConf look up is a hash table look up.
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