Martin,
I see what you mean, and it would work in your particular case, but it does
not make
sense in general, please review how sql views work, under the notion of a
general
mechanism (as a data source that can be queried), not under the lenses of
your
specific wms generalization use case, and it will be pretty evident this
road cannot be
taken into consideration
Cheers
Andrea
On Fri, Mar 13, 2015 at 3:38 AM, Martin Davis <mtncl...@gmail.com> wrote:
>
>>
>>
>>>
>>> To take another slant on this, I realized that the source of the
>>> problem is that for SQL views the "custom SQL" is wrapped in parens before
>>> the WMS bbox filter condition is appended to it. This is what's causing the
>>> DB to complain that the geometry column expression doesn't have an index.
>>> If there was a way to avoid using the parens that would solve the problem
>>> nicely (there would be no need for any macros in the user-supplied SQL,
>>> they could use any expression around the GEOMETRY column (renaming it to
>>> GEOMETRY) and they wouldn't have to supply their own bbox filter
>>> condition. One issue is deciding how to append the bbox condition - it
>>> would be necessary to know whether or not a WHERE clause was already
>>> present. This could perhaps be determined by a flag supplied by the user.
>>>
>>>
>> Hmmm... example please?
>>
>
>
> Sure (although making this up from memory since I'm not near my
> GeoServer)...
>
> If the SQL view is
>
> SELECT GEOMETRY, A FROM TBL
>
> then during WMS rendering Geoserver emits the query
>
> SELECT GEOMETRY FROM (SELECT GEOMETRY, A FROM TBL) WHERE
> SDO_FILTER(GEOMETRY, ...)
>
> If the SQLView is
>
> SELECT SDO_CENTROID(GEOMETRY) GEOMETRY, A FROM TBL
>
> then GeoServer emits
>
> SELECT GEOMETRY FROM (SELECT SDO_CENTROID(GEOMETRY) GEOMETRY A FROM TBL)
> WHERE SDO_FILTER(GEOMETRY, ...)
>
> And Oracle squawks because the GEOMETRY referred to in the SDO_FILTER is
> an alias for an expression, which has not index.
>
> Using a different alias (say PT) doesn't work either, because GeoServer
> emits:
>
> SELECT PT FROM (SELECT SDO_CENTROID(GEOMETRY) PT A FROM TBL)
> WHERE SDO_FILTER(PT, ...)
>
> If the SQLView was not contained in a subselect then this would work fine:
>
> SELECT SDO_CENTROID(GEOMETRY) GEOMETRY A FROM TBL WHERE
> SDO_FILTER(GEOMETRY, ...)
>
>
>
>
--
==
GeoServer Professional Services from the experts! Visit
http://goo.gl/NWWaa2 for more information.
==
Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549
http://www.geo-solutions.it
http://twitter.com/geosolutions_it
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