I was thinking the UDTF would be like a stored procedure.
Reads a local table retrieving values into variables.
Does some three part naming trick to select from the remote database based
upon these variables.
Adds row into udtf
Then if you want to build a view over this udtf you could.
Basically the same sort of stuff many of the IBM i Services do. Although
they often even extend that out by consuming web services (like available
PTF groups) instead of just remote databases.
there are two diffrent cases:
- remote table function: doesn't help so much, you would have some remote
- local table function: I didn't ever try, if you could make a remote
connect in a local table function, but I don't think so. Three part alias
could be used for create (local) table as select from (remote) table or
insert into (local) table select * from (remote) table, but you couldn't use
as a (remote) subselect in other (local) SQL statements.
There might be workarounds to fake the local DB and pull a remote Resultset
in a local table, but I don't see a possibility to use this in the same
statement as local table in a join. Even if you would find such a workaround
it would be as slow as a two step solution or moving this to MS SQL Server
and DB2 as linked Server.
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