Adding or Modifying a Routine Modifier

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Adding or Modifying a Routine Modifier

Use this segment in the ALTER FUNCTION, ALTER PROCEDURE, or ALTER ROUTINE statement to add or modify values for routine modifiers of a UDR.

Adding or Modifying a Routine Modifier:
 
|--+-+-+--------------------------------+-+----------+----------|
   | | |  (1)    (2)                    | |          |
   | | '---------------+-----+--VARIANT-' |          |
   | |                 '-NOT-'            |          |
   | '-NEGATOR =neg_func------------------'          |
   |  (3)                                            |
   '------+-CLASS =class_name----------------------+-'
          +-ITERATOR-------------------------------+
          +-PARALLELIZABLE-------------------------+
          |  (1)                                   |
          '--------+---HANDLESNULLS--------------+-'
                   +-INTERNAL--------------------+
                   |                  .- 0---.   |
                   +-+-PERCALL_COST =-+-cost-+-+-+
                   | '-COSTFUNC =cost_func-----' |
                   +-+-SELFUNC =sel_func-----+---+
                   | '-SELCONST =selectivity-'   |
                   '-STACK =stack_size-----------'

Notes:

C language
Stored Procedure Language
External routines only

Element	Description	Restrictions	Syntax
class_name	Virtual processor (VP) class in which to run the external routine	Any C UDR must run in the CPU VP or in a user-defined VP class	Quoted String.
cost	CPU use cost for each invocation of a C language UDR. Default is `0`.	Integer; 1 ≤ cost ≤ 2³¹-1 (highest cost).	Literal Number
cost_func	Name of a companion user-defined cost function to invoke	Must have same owner as the UDR. Execute privilege needed to invoke	Identifier
neg_func	Negator function that can be invoked instead of the UDR	Must have same owner as the UDR. Execute privilege needed to invoke	Identifier
sel_func	Name of a companion user-defined selectivity function to invoke	Must have same owner as the UDR. Execute privilege needed to invoke	Identifier
selectivity	CPU use cost for each invocation of a C language UDR. Default is `0.`	See Concept of Selectivity.	Literal Number
stack_size	Size (in bytes) of stack of the thread that executes the C-language UDR	Must be a positive integer	Literal Number

You can add these modifiers in any order. If you list the same modifier more than once, the last setting overrides any previous values.