postgis layer with USING UNIQUE and queries

[assefa]

I run into an issue where the DATA definition is like this

DATA "wkb_geometry from folie001_test USING UNIQUE objnr"

when a getshape is called, It end up being translated into a postgis query the would end up like:

...from folie001_test where "objnr" = 0

0 being the shape index asked. This would generate errors.

Removing the USING UNIQUE objnr gives the correct result.