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The "Hive/LanguageManual/UDF" page has been changed by JohnSichi.
http://wiki.apache.org/hadoop/Hive/LanguageManual/UDF?action=diff&rev1=59&rev2=60

The following builtin mathematical functions are supported in hive; most return NULL when
the argument(s) are NULL:
<10%>'''Return Type''' <15%>'''Name(Signature)''' '''Description''' 
BIGINT round(double a) Returns the rounded BIGINT value of the double 
+ DOUBLE round(double a, int d) Returns the double rounded to d decimal places
BIGINT floor(double a) Returns the maximum BIGINT value that is equal or less than
the double 
BIGINT ceil(double a), ceiling(double a) Returns the minimum BIGINT value that is
equal or greater than the double 
double rand(), rand(int seed) Returns a random number (that changes from row to row)
that is distributed uniformly from 0 to 1. Specifiying the seed will make sure the generated
random number sequence is deterministic. 
