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Hive 0.13.0 introduced hive.auto.convert.join.use.nonstaged with a default of false (HIVE-6144).

For conditional joins, if the input stream from a small alias can be directly applied to the join operator without filtering or projection, then it does not need to be pre-staged in the distributed cache via a MapReduce local task. Setting hive.auto.convert.join.use.nonstaged to true will avoid avoids pre-staging in those cases.