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The "Hive/LanguageManual/UDF" page has been changed by PaulYang.
http://wiki.apache.org/hadoop/Hive/LanguageManual/UDF?action=diff&rev1=38&rev2=39

BIGINT round(double a) Returns the rounded BIGINT value of the double 
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 evenly from 0 to 1. Specifiying the seed will make sure the generated
random number sequence is deterministic. 
+ 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. 
double exp(double a) Returns e^a where e is the base of the natural logarithm 
double ln(double a) Returns the natural logarithm of the argument 
double log10(double a) Returns the base10 logarithm of the argument 
