[SPARK-18107][SQL][FOLLOW-UP] Insert overwrite statement runs much slower in spark-sql than it does in hive-client#15726

viirya wants to merge 3 commits into

apache:masterapache/spark:masterfrom

viirya:improve-hive-insertoverwrite-followupviirya/spark-1:improve-hive-insertoverwrite-followupCopy head branch name to clipboard