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The "Hive/LanguageManual/UDF" page has been changed by ArvindPrabhakar. http://wiki.apache.org/hadoop/Hive/LanguageManual/UDF?action=diff&rev1=44&rev2=45 -------------------------------------------------- == Built-in Aggregate Functions (UDAF) == The following are built-in aggregate functions are supported in Hive: ||<10%>Return Type''' ''' ||<10%>Name(Signature)''' ''' ||Description''' ''' || - ||bigint ||count(1), count(DISTINCT col [, col]...) ||count(1) returns the number of members in the group, whereas the count(DISTINCT col) gets the count of distinct values of the columns in the group || + ||bigint ||count(*), count(expr), count(DISTINCT expr[, expr...]) || count(*) - Returns the total number of retrieved rows, including rows containing NULL values; count(expr) - Returns the number of rows for which the supplied expression is non-NULL; count(DISTINCT expr[, expr]) - Returns the number of rows for which the supplied expression(s) are unique and non-NULL. || ||double ||sum(col), sum(DISTINCT col) ||Returns the sum of the elements in the group or the sum of the distinct values of the column in the group || ||double ||avg(col), avg(DISTINCT col) ||Returns the average of the elements in the group or the average of the distinct values of the column in the group || ||double ||min(col) ||Returns the minimum of the column in the group ||
