On Tue, Jun 21, 2011 at 3:33 PM, Justin Deoliveira <[email protected]>wrote:
> Hi guys,
>
> Yes, the ability to join on custom filters was done intentionally, mostly
> to support spatial joins. If app-schema were to move to this api for joining
> for the time being maybe it would be possible just to throw an exception.
>
> If you look at the join class it has a Type property which is an
> enumeration, INNER, OUTER, etc... so allows you to specify the type of join
> you wish to do.
>
> It is probably best to think about this specific proposal as "joining for
> simple features" (I can see the look of disdain now). In the proposal
> document I propose what the schema of "joined feature" should look like, but
> don't mention any restriction about how actual features are returned which
> was sort of intentional. In my case indeed i intent to return the same
> feature multiple times, as would happen in an SQL query. I realize this is
> not the app-schema / complex feature way but perhaps we can keep that an
> implementation detail? Maybe we assume that any DataStore (DataStore here
> meaning simple features) follows the SQL semantics, and anything not
> implementing DataStore (DataAccess) will return complex features. Or perhaps
> we declare the behaviour somewhere in QueryCapabilities. Not sure. Anywho,
> if possible I would like to keep this proposal with just the api... and
> again hopefully keep how the features are returned to be an implementation
> detail.
>
Justin, as far as I understand repeating the same feature multiple times in
the output is actually what the WFS joining requires, no?
The output is made of tuple of features, it's not a new feature type (which
would not have a schema in DescribeFeatureType)
with multiple children and the like.
That said, app-schema could build on top of these results pretty much like
as on top of a sql result, unless I'm missing something.
Am I missing something?
Cheers
Andrea
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Ing. Andrea Aime
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