query: SELECT cos(null)
FROM src LIMIT 1
Input: default/src
Output: file:/home/kmangla/hive/build/ql/tmp/1815431857/10000
NULL
query: SELECT cos(0.98), cos(1.57), cos(-0.5)
FROM src LIMIT 1
Input: default/src
Output: file:/home/kmangla/hive/build/ql/tmp/1350046602/10000
0.5570225467662173	7.963267107332633E-4	0.8775825618903728