Function Operations

`pgm.createFunction( function_name, function_params, function_options, definition )`

Create a new function - postgres docs

Arguments:

function_name [Name] - name of the new function
function_params [array] - parameters of the new function

Either array of strings or objects. If array of strings, it is interpreted as is, if array of objects:
- mode [string] - IN, OUT, INOUT, or VARIADIC
- name [string] - name of argument
- type [string] - datatype of argument
- default [string] - default value of argument
function_options [object] - options:
- returns [string] - returns clause
- language [string] - language name of function definition
- replace [boolean] - create or replace function
- window [boolean] - window function
- behavior [string] - IMMUTABLE, STABLE, or VOLATILE
- onNull [boolean] - RETURNS NULL ON NULL INPUT
- parallel [string] - UNSAFE, RESTRICTED, or SAFE
definition [string] - definition of function

Reverse Operation: dropFunction

`pgm.dropFunction( function_name, function_params, drop_options )`

Drop a function - postgres docs

Arguments:

function_name [Name] - name of the function to drop
function_params [array] - see
drop_options [object] - options:
- ifExists [boolean] - drops function only if it exists
- cascade [boolean] - drops also dependent objects

`pgm.renameFunction( old_function_name, function_params, new_function_name )`

Rename a function - postgres docs

Arguments:

old_function_name [Name] - old name of the function
function_params [array] - see
new_function_name [Name] - new name of the function