-475 THE RESULT TYPE `type-1` OF THE SOURCE FUNCTION CANNOT BE CAST TO THE RETURNS TYPE `type-2` OF THE USER-DEFINED FUNCTION `function-name`

Explanation
  In order for the CREATE FUNCTION for a sourced
user-defined function to be valid, the result type (type-1)
of the source function must be castable to the RETURNS type (type-2)
of the function being created. There is no supported cast between
these data types.

System action
  The statement cannot be processed.

Programmer response
  Change the RETURNS data type or the SOURCE
function identified so that the result type of the SOURCE function
is castable to the RETURNS data type.

SQLSTATE
  42866

-475 THE RESULT TYPE type-1 OF THE SOURCE FUNCTION CANNOT BE CAST TO THE RETURNS TYPE type-2 OF THE USER-DEFINED FUNCTION function-name

Explanation

System action

Programmer response

SQLSTATE

-475 THE RESULT TYPE `type-1` OF THE SOURCE FUNCTION CANNOT BE CAST TO THE RETURNS TYPE `type-2` OF THE USER-DEFINED FUNCTION `function-name`