For instance sql_query:
<pre>
SELECT kbnum as id             , 'feature' as origin             , 'ch.swisstopo.pixelkarte-pk100.metadata' as layer             , quadindex(the_geom) as geom_quadindex             , y(st_transform(st_centroid(the_geom),4326)) as lat             , x(st_transform(st_centroid(the_geom),4326)) as lon             , st_box2d(the_geom) as geom_st_box2d             , lk_name::text as label             , kbnum::text as feature_id         FROM datenstand.view_gridstand_datenhaltung_pk100_tilecache
</pre>
is never found.