TAJO-650: Repartitioner::scheduleHashShuffledFetches should adjust the number of tasks.
TAJO-427: Empty table makes IndexOutOfBoundsException at LEFT OUTER JOIN clause. (jaehwa)
TAJO-665: sort buffer size must be dealt as long type values. (hyoungjunkim via hyunsik)
TAJO-663: CREATE TABLE USING RAW doesn't throw ERROR. (jaehwa)
TAJO-663: CREATE TABLE USING RAW doesn't throw ERROR. (Adding missed codes)