PREHOOK: query: DESCRIBE FUNCTION acos
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION acos
POSTHOOK: type: DESCFUNCTION
acos(x) - returns the arc cosine of x if -1<=x<=1 or NULL otherwise
PREHOOK: query: DESCRIBE FUNCTION EXTENDED acos
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION EXTENDED acos
POSTHOOK: type: DESCFUNCTION
acos(x) - returns the arc cosine of x if -1<=x<=1 or NULL otherwise
Example:
  > SELECT acos(1) FROM src LIMIT 1;
  0
  > SELECT acos(2) FROM src LIMIT 1;
  NULL
PREHOOK: query: SELECT acos(null)
FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT acos(null)
FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
NULL
PREHOOK: query: SELECT acos(0)
FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT acos(0)
FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
1.5707963267948966
PREHOOK: query: SELECT acos(-0.5), asin(0.66)
FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT acos(-0.5), asin(0.66)
FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
2.0943951023931957	0.7208187608700897
PREHOOK: query: SELECT acos(2)
FROM src LIMIT 1
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT acos(2)
FROM src LIMIT 1
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
NaN