CREATE FUNCTION with PARAMETERS - bug in documentation or functionality?

What is the correct syntax for creating an SQL function with a named parameter?

The documentation at http://orientdb.com/docs/2.1/SQL-Create-Function.html is not very clear about how the named parameter should be used in the function body.

I have tried numerous variants of the following:

CREATE FUNCTION get "SELECT FROM Person WHERE name = ?" PARAMETERS [VAL] LANGUAGE SQL;

The function is successfully defined, but cannot be successfully used.

Consider for example this transcript:

OrientDB console v.2.1.5 (build 2.1.x@r; 2015-10-29 16:54:25+0000) www.orientdb.com
...
orientdb {db=diner}> SELECT count(*) FROM Person WHERE name = "Bill"

----+------+-----
#   |@CLASS|count
----+------+-----
0   |null  |1    
----+------+-----

1 item(s) found. Query executed in 0.002 sec(s).

orientdb {db=diner}> CREATE FUNCTION get "SELECT FROM Person WHERE name = ?" PARAMETERS [VAL] LANGUAGE SQL;

Function created successfully with id=#6:34

orientdb {db=diner}> select get("Bill")

----+------+----
#   |@CLASS|get 
----+------+----
0   |null  |[0] 
----+------+----

Note: For JAVASCRIPT functions, the situation is different, because one can (for example) write:

CREATE FUNCTION get 'return orient.getDatabase().query("select count(*) from " + val)[0]' PARAMETERS [val] LANGUAGE JAVASCRIPT

Thanks!

[pkoppstein]

By trial and error, I found that the key is the humble colon:

CREATE FUNCTION get "SELECT FROM V WHERE name = :VAL" PARAMETERS [VAL] LANGUAGE SQL IDEMPOTENT TRUE;

So this is a documentation issue/bug.

Unfortunately, the result of calling get(_) is not quite the same as the result obtained calling SELECT directly. Documentation about that, I believe, is also needed.

[MBharu]

Also, kindly provide the syntax to drop/delete a user-defined function from console.