TAJO-354: Fix invalid type to valid type for udfs(bit_length/char_length) (DaeMyung Kang via hyunsik)
TAJO-371: Increase the default value of worker memory. (jihoon)
TAJO-306: Implement ascii(string) function. (SeongHwa Ahn via jaehwa)
TAJO-375: TajoClient can't get result data when different os user. (hyoungjunkim via hyunsik)
TAJO-359: Implement lpad function. (Seungun Choe via jaehwa)
TAJO-361: Implement rpad function. (Seungun Choe via jaehwa)
TAJO-364: Implement mod/div function. (DaeMyung Kang via jaehwa)
TAJO-316: Improve GreedyHeuristicJoinOrderAlgorithm to deal with non-commutative joins. (hyunsik)
TAJO-268: Temporal files should be removed after query is finished. (jinho)
TAJO-292: Too many intermediate partition files. (jinho)
TAJO-387: Query is hanging when errors occurs in Query or SubQuery class. (hyunsik)
TAJO-387: Query is hanging when errors occurs in Query or SubQuery class. (Added a missed changelog)
TAJO-389: The LazyTuple does not work when number format exception occurs in text deserializer. (jinho)
TAJO-304: drop table command should not remove data files in default. (hyunsik)
TAJO-388: limit clause does not work properly. (hyunsik)
TAJO-391: Change the default type of real values from FLOAT4 to FLOAT8 when parsing the user queries. (DaeMyung Kang via jihoon)
TAJO-343: Implement locate function. (KyoungBok Lee via hyunsik)
Update documentation by TAJO-317. (Keuntae Park, jihoon, and hyunsik)
TAJO-393: Unit tests must use test-data directory. (hyunsik)
TAJO-344: Tajo cannot recognize negative numeric expressions. (hyunsik)
TAJO-397: Implement sign function. (DaeMyung Kang via hyunsik)