PREHOOK: query: DESCRIBE FUNCTION rtrim
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION rtrim
POSTHOOK: type: DESCFUNCTION
rtrim(str) - Removes the trailing space characters from str 
PREHOOK: query: DESCRIBE FUNCTION EXTENDED rtrim
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION EXTENDED rtrim
POSTHOOK: type: DESCFUNCTION
rtrim(str) - Removes the trailing space characters from str 
Example:
  > SELECT rtrim('facebook   ') FROM src LIMIT 1;
  'facebook'