There is min function for text parameter, where there is no max function for text parameter. We need to add it.
Created a review request against branch master in reviewboard
It got +1 on RB. committed it to master.
ABORTED: Integrated in Tajo-master-build #47 (See https://builds.apache.org/job/Tajo-master-build/47/)
TAJO-569: Add max(TEXT) function. (hyunsik) (hyunsik: https://git-wip-us.apache.org/repos/asf?p=incubator-tajo.git&a=commit&h=d516fc499d646b230fb38ebb1fdd72113d46a536)