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A single spatial SQL query.
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Using the same routines that Oracle does we can convert our
extra selection objects into Geometry and Distance objects.
TODO: Make converted objects 'lazy' for less overhead.
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Overridden from GeoQuery's normalize to handle the conversion of
GeoAggregate objects.
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Returns the first Geometry field encountered; or specified via the
`field_name` keyword. The `field_name` may be a string specifying
the geometry field on this GeoQuery's model, or a lookup string
to a geometry field via a ForeignKey relation.
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