Add test for custom bbox in postgresql provider

See #18107

tests/src/python/test_provider_postgres.py

@@ -1376,6 +1376,25 @@ class TestPyQgsPostgresProvider(unittest.TestCase, ProviderTestCase):
         self.assertEqual(vl.featureCount(), 4000)
         print("--- %s seconds ---" % (time.time() - start_time))
 
+    def testFilterOnCustomBbox(self):
+        extent = QgsRectangle(-68, 70, -67, 80)
+        request = QgsFeatureRequest().setFilterRect(extent)
+        dbconn = 'dbname=\'qgis_test\''
+        uri = '%s srid=4326 key="pk" sslmode=disable table="qgis_test"."some_poly_data_shift_bbox" (geom)' % (dbconn)
+
+        def _test(vl, ids):
+            values = {feat['pk']: 'x' for feat in vl.getFeatures(request)}
+            expected = {x: 'x' for x in ids}
+            self.assertEqual(values, expected)
+
+        vl = QgsVectorLayer(uri, "testgeom", "postgres")
+        self.assertTrue(vl.isValid())
+        _test(vl, [2, 3])
+
+        vl = QgsVectorLayer(uri + ' bbox=shiftbox', "testgeom", "postgres")
+        self.assertTrue(vl.isValid())
+        _test(vl, [1, 3])
+
 
 class TestPyQgsPostgresProviderCompoundKey(unittest.TestCase, ProviderTestCase):
 

tests/testdata/provider/testdata_pg.sql

@@ -638,3 +638,18 @@ INSERT INTO qgis_test.geometries_table VALUES
 CREATE VIEW qgis_test.geometries_view AS (SELECT * FROM qgis_test.geometries_table);
 
 CREATE TABLE qgis_test.geometryless_table (name VARCHAR, value INTEGER);
+
+---------------------------------------------
+--
+-- View with separate bbox field
+--
+
+CREATE VIEW qgis_test.some_poly_data_shift_bbox AS
+ SELECT pk,
+        geom,
+        ST_Translate(
+          ST_Envelope(geom),
+          ST_XMax(ST_Envelope(geom)) - ST_XMin(ST_Envelope(geom)),
+          0.0
+        ) AS shiftbox
+   FROM qgis_test.some_poly_data;