better debugging
----------------
Key: HIVE-677
URL: https://issues.apache.org/jira/browse/HIVE-677
Project: Hadoop Hive
Issue Type: Improvement
Components: Query Processor
Reporter: Namit Jain
Currently, we have no idea how many rows are being produced by join/file sink
while the process is running.
It makes the tasks very difficult to debug - it would be very useful to dump
some stats while the process (mapper/reducer) is running
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