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

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

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  === String Functions ===
  The following are built-in String functions are supported in hive:
+ || int || length(string A) || returns the length of the string ||
  ||string ||concat(string A, string B)||returns the string resulting from concatenating B after A e.g. concat('foo', 'bar') results in 'foobar'||
  ||string ||substr(string A, int start) ||returns the substring of A starting from start position till the end of string A e.g. concat('foobar', 4) results in 'bar' (see [[http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_substr | MySQL substr]])||
  ||string ||substr(string A, int start, int len) ||returns the substring of A starting from start position with length len e.g. concat('foobar', 4, 1) results in 'b' (see [[http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_substr | MySQL substr]]) ||