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

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  ||double ||log(double base, double a) ||Return the base "base" logarithm of 
the argument||
  ||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||
  
  === Collection Functions ===
  The following built-in collection functions are supported in hive:

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