speedup addInputPaths
---------------------
Key: HIVE-2218
URL: https://issues.apache.org/jira/browse/HIVE-2218
Project: Hive
Issue Type: Improvement
Reporter: He Yongqiang
Assignee: He Yongqiang
Speedup the addInputPaths for combined symlink inputformat, and added some
other micro optimizations which also work for normal cases.
This can help reducing the start time of one query from 5 hours to less than 20
mins.
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