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 24.2.1 Features of the User-Defined Function Interface
 ------------------------------------------------------
 
 The MySQL interface for user-defined functions provides the following
 features and capabilities:
 
    * Functions can return string, integer, or real values.
 
    * You can define simple functions that operate on a single row at a
      time, or aggregate functions that operate on groups of rows.
 
    * Information is provided to functions that enables them to check
      the number and types of the arguments passed to them.
 
    * You can tell MySQL to coerce arguments to a given type before
      passing them to a function.
 
    * You can indicate that a function returns `NULL' or that an error
      occurred.
 

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