]
Steven Hawkins commented on TEIIDDES-992:
-----------------------------------------
The terms here are a bit over-loadded.
A UDF is any function that is not a Teiid system function.
The term pushdown by itself means that we will evaluate at the source, just as Ramesh
says. However in the context of UDFs it's important to not the difference between the
pushdown modes - optional, never, always.
We have to be careful not to conflate a "never pushdown UDF" with simply UDF. A
UDF can have other modes.
We have commonly used the term "pushdown function" as a short-cut to mean an
"always pushdown UDF". The only reason we should be careful is that "all
pushdown functions" include Teiid system functions - which have a much different
API/user level handling.
Allow the use of pushdown functions without requiring Java
programming
----------------------------------------------------------------------
Key: TEIIDDES-992
URL:
https://issues.jboss.org/browse/TEIIDDES-992
Project: Teiid Designer
Issue Type: Feature Request
Affects Versions: 7.4
Reporter: Bernd Groh
Assignee: Barry LaFond
Fix For: 7.5, 7.4.2
Attachments: CreatePushdownFunctionDialog_draft.png, ProductsSQL.xmi,
PushdownFunction.gif, PushdownFunction.gif, PushdownVDB.vdb,
TEIIDDES-992_pushdownfunctions.patch
Currently, in order to use a database function, even if pushdown is required, it is still
necessary to add the function interface to a Java class within the connector, and the
connector then must be deployed to the server in order to allow for this pushdown function
to be used within the Designer. This creates a lot of extra effort every time you want to
make use of a new database function. Particularly, given the schema designer doesn't
necessarily have access to either the connector code or the server, and then must involve
other parties simply to be able to use an additional database function. It would be very
beneficial to speedy schema development if that was not necessary, and if, say, the
interface could be defined on the Designer side, added to the VDB, and then deployed as
part of the VDB.
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