[Hadoop Wiki] Update of "Hive/LanguageManual/UDF" by NamitJain

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The following page has been changed by NamitJain:
http://wiki.apache.org/hadoop/Hive/LanguageManual/UDF

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  ||double ||pow(double a, double p) ||Return a^p||
  ||double ||power(double a, double p) ||Synonym of pow||
  ||double ||sqrt(double a) ||Return the square root of a||
+ ||double ||bin(double a) ||Return the number in binary format||
+ ||double ||hex(double a) ||Return the number in hex format||
+ ||double ||conv(double num, int from_base, int to_base) ||Convert a number from a given base to another||
  
  === Collection Functions ===
  The following built-in collection functions are supported in hive: