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This subclass overrides `process` to better handle geographic SQL
construction.
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Used to represent the SQL where-clause for spatial databases --
these are tied to the GeoQuery class that created it.
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Utility for checking the given lookup with the given model options.
The lookup is a string either specifying the geographic field, e.g.
'point, 'the_geom', or a related lookup on a geographic field like
'address__point'.
If a GeometryField exists according to the given lookup on the model
options, it will be returned. Otherwise returns None.
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