TAJO-193: Add string pattern matching operators. (hyunsik)
TAJO-185: Implement split_part function. (hyunsik)
TAJO-198: The split function does not work properly. (jinho)
TAJO-194: LogicalNode should have an identifier to distinguish each logical node instance. (hyunsik)
TAJO-191: INSERT OVERWRITE INTO statement should follow the table meta in catalog. (jinho)
TAJO-197: Implement Enforcer that forces physical planner to choose specified algorithms. (hyunsik)
TAJO-205: Repartitioner occasionally chooses a partition number as one. (hyunsik)
TAJO-203: Field delimiter does not work correctly. (jinho)
TAJO-213: NULL characters in meta of csv table should be supported. (jinho)
TAJO-210: Implement String concatenation operator. (hyunsik)
TAJO-145: count(distinct column) should be supported. (hyunsik)
TAJO-214: System should inquire finished query history after execution in web. (SeongHwa Ahn via hyunsik)
TAJO-212: Implement type cast expresion. (hyunsik)
TAJO-211: Implement regexp_replace function. (hyunsik)
TAJO-216: Improve FilterPushDownRule and Implement physical operators for outer join. (camelia_c via hyunsik)
TAJO-224: Rearrange DataType enumeration and Refactor type systems. (hyunsik)
TAJO-199: All relations in catalog must have data volume size. (hyunsik)
TAJO-223: Maximize disk read bandwidth utilization of StorageManagerV2 by moving Tuple creation role to next() (Keuntae Park via hyunsik)
TAJO-220: Implement catalog dump feature. (hyunsik)
TAJO-229: Implement JoinGraph to represent a graph of relation joins. (hyunsik)