[mapserver-users] Highly inefficient MakeValid statement in Mapserver-generated spatial queries

[ikeszei at yahoo.com]

Hello, 

 

I noticed that when MapServer issues the query to MS SQL Server, it appends
a .MakeValid() tag to the geometry field, which makes data access highly
inefficient as no spatial indexes can be used when the MakeValid() is used.
Here is the query that is being produced:

 

SELECT 

convert(nvarchar(max), [label]),

[ogr_geometry],

convert(varchar(36), [ogr_fid]) 

FROM 

section 

WHERE 

ogr_geometry.MakeValid().STIntersects(geometry::STGeomFromText('POLYGON((-10
973271.1167343 5605636.0681215,-10963019.0003155
5605636.0681215,-10963019.0003155 5614459.76757417,-10973271.1167343
5614459.76757417,-10973271.1167343 5605636.0681215))',3857)) = 1

 

Here is the data access string from the map file:

 

DATA "ogr_geometry from section USING UNIQUE ogr_fid USING SRID=3857"

 

Earlier I was using a specific HINT for index usage:

 

DATA "ogr_geometry from section WITH (INDEX(section_ogr_geometry_idx)) USING
UNIQUE ogr_fid USING SRID=3857"

 

But since MapServer adds the MakeValid automatically, I am getting the
following error:

 

Msg 8635, Level 16, State 9, Line 1

The query processor could not produce a query plan for a query with a
spatial index hint.  Reason: Could not find required binary spatial method
in a condition.  Try removing the index hints or removing SET FORCEPLAN.

 

How do I configure mapserver to NOT ADD the MakeValid to every single one of
its queries ?

 

Any response is much appreciated !

 

Thanks,

Istvan

 

 

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