Fix query over classtype tables #3128
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The case statement prevented the index on the classtype tables from being used. Move the case statement inside the geometry function instead.
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The query tried to be clever and combine the two cases where lookup is done with a ST_Contains for large areas and a radius search for everything else. When doing this with a CASE construct, the query planner cannot make use of the index. So we now create an appropriate bounding box for the radius search and do a contains operation for all cases.