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Currently the number of rows in a partition remains empty.
A hive MR job aggregates row count and raw datasize as it writes out the data, publishes this to a temporary mysql table. On the client side the information is aggregated for all mappers/reducers.
Hive-io should do something similar
Relevant hive code is here http://svn.apache.org/repos/asf/hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/stats/jdbc/