On Wed, Mar 18, 2015 at 5:38 PM, Roel De Nijs <[email protected]>
wrote:
> Hi list,
>
>
>
> Seems I solved this issue myself. When I replace 'outerBoundaryIs' by
> 'exterior', the polygon isn’t empty anymore and the same bunch of features
> as with the GET-request are returned. Yay!
>
Yep, the original GML was invalid, mixing GML 2 and GML3 elements.
>
>
> Now I have another question. When I turned verbose logging on I see the
> following query being executed fort this request:
>
>
>
> SELECT "prop1","prop2" FROM "table1" WHERE
> "the_geom".Filter(geometry::STGeomFromText('POLYGON ((142578.64599609
> 252217.79003906, 73781.897460938 141983.61767578, 287078.38037109
> 146764.85888672, 142578.64599609 252217.79003906))', 31370)) = 1 AND
> "the_geom".STIntersects(geometry::STGeomFromText('POLYGON ((142578.64599609
> 252217.79003906, 73781.897460938 141983.61767578, 287078.38037109
> 146764.85888672, 142578.64599609 252217.79003906))', 31370)) = 1
>
>
>
> Why does the where-clause has two conditions: Filter and STIntersects? I
> would only expecte the STIntersects one.
>
Primary and secondary filter... the first one uses the spatial index, the
second does the in memory filtering.
Or has SQL Server learned to use the spatial index when just seeing
STIntersects?
Even if it does, we'd might have to keep the current syntax for backwards
compatibility with older versions
That said, SQLServer optimizer is really poor and expects some complicated
setup in order to better optimize the queries (basically, writing the query
in more than one bit, setting variables first in a few statements, then
using them in the query) which is difficult to support with our current
shared codebase for all databases... it's not impossible though, we are
basically waiting for people to sponsor this work, as it's not small (won't
fit in anybody's spare time).
Cheers
Andrea
--
==
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