Executing remote function locally

Question

Is there a way to execute a remote function locally.
Example
I have two database DB1,DB2.
I have a table tab1 in DB1 and fun1 in DB2
When i try to execute a query as below
select * from DB1
where fun1@dblinktodb2(c1,c2) not in (1,2,3,4,5)
it takes 1 and half hour to fetch all the results.
I created same function fun2 mimicing fun1@dblinktodb2
select * from DB1
where fun2(c1,c2) not in (1,2,3,4,5)
it takes 7 minutes.
we don't want to maintain two version of same function (ofcourse in this case fun1 is created by different team so we don't to have copy which can leave the code outdate )
Is there a way to execute fun1@dblinktodb2 locally.
Note fun1@dblinktodb2 doesnot uses any schema objects.

Answer 1

A function can only execute in the database in which it is defined. You could potentially automate the replication of that function to your local database so that you didn't have to manually maintain anything, but you would need a local copy of the function if you want it to execute on the local database.
Justin