TAJO-341: Implement substr function. (hyoungjunkim via hyunsik)
TAJO-207: Implement bit_length(string) function. (DaeMyung Kang via jihoon)
TAJO-345: MergeScanner should support projectable storages. (jihoon)
TAJO-207: Implement bit_length(string) function. (fixed a missing log in CHANGES.txt)
TAJO-347: Fix bug when to call function with insensitive function name. (DaeMyung Kang via hyunsik)
TAJO-350: Implement round, floor, ceil. (hyoungjunkim via hyunsik)
TAJO-342: Implement strpos(string, substring) function. (hyoungjunkim via hyunsik)
TAJO-351: TAJO-351: Implement reverse(text). (DaeMyung Kang via hyunsik)
TAJO-349: Implement md5(text). (DaeMyung Kang via hyunsik)
TAJO-346: Implement hex function. (DaeMyung Kang via hyunsik)
TAJO-317: Improve TajoResourceManager to support more elaborate resource management. (Keuntae Park via jihoon)
TAJO-352: Implement right/left(text, size) function. (DaeMyung Kang via hyunsik)
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-tajo into OUTER_JOIN
Almost done.