public static boolean isFullOuterEnabledForDynamicPartitionHashJoin(HiveConf hiveConf, JoinOperator joinOp)
      throws SemanticException {
    return true;
  }
convert a regular join to a a map-side join.

@param op
         join operator
@param mapJoinPos
         position of the source to be read as part of map-reduce framework. All other sources
         are cached in memory
@param noCheckOuterJoin
@param validateMapJoinTree
ql/src/java/org/apache/hadoop/hive/ql/optimizer/MapJoinProcessor.java