[Backport 3.16] [OGR provider] Fix wrong gpkg_metadata_reference_column_name_update trigger

src/core/providers/ogr/qgsogrprovider.cpp

@@ -4353,6 +4353,42 @@ GDALDatasetH QgsOgrProviderUtils::GDALOpenWrapper( const char *pszPath, bool bUp
   if ( phDriver )
     *phDriver = hDrv;
 
+#if GDAL_VERSION_NUM < GDAL_COMPUTE_VERSION(3, 3, 1)
+  if ( bUpdate && bIsGpkg && strcmp( GDALGetDriverShortName( hDrv ), "GPKG" ) == 0 )
+  {
+    // Fix wrong gpkg_metadata_reference_column_name_update trigger that was
+    // generated by GDAL < 2.4.0
+    OGRLayerH hSqlLyr = GDALDatasetExecuteSQL(
+                          hDS,
+                          "SELECT sql FROM sqlite_master WHERE type = 'trigger' AND "
+                          "NAME ='gpkg_metadata_reference_column_name_update' AND "
+                          "sql LIKE '%column_nameIS%'",
+                          nullptr, nullptr );
+    if ( hSqlLyr )
+    {
+      QString triggerSql;
+      gdal::ogr_feature_unique_ptr hFeat( OGR_L_GetNextFeature( hSqlLyr ) );
+      if ( hFeat )
+      {
+        triggerSql = OGR_F_GetFieldAsString( hFeat.get(), 0 );
+      }
+      GDALDatasetReleaseResultSet( hDS, hSqlLyr );
+
+      if ( !triggerSql.isEmpty() )
+      {
+        GDALDatasetExecuteSQL(
+          hDS, "DROP TRIGGER gpkg_metadata_reference_column_name_update",
+          nullptr, nullptr );
+        GDALDatasetExecuteSQL(
+          hDS,
+          triggerSql.replace( QLatin1String( "column_nameIS" ),
+                              QLatin1String( "column_name IS" ) ).toUtf8().toStdString().c_str(),
+          nullptr, nullptr );
+      }
+    }
+  }
+#endif
+
   return hDS;
 }
 

tests/src/python/test_provider_ogr_gpkg.py

@@ -2086,6 +2086,48 @@ def testRejectedGeometryUpdate(self):
         g = [f.geometry() for f in vl.getFeatures()][0]
         self.assertEqual(g.asWkt(), 'Polygon ((0 0, 0 1, 1 1, 1 0, 0 0))')
 
+    def testFixWrongMetadataReferenceColumnNameUpdate(self):
+        """ Test that we (or GDAL) fixes wrong gpkg_metadata_reference_column_name_update trigger """
+        tmpfile = os.path.join(self.basetestpath, 'testFixWrongMetadataReferenceColumnNameUpdate.gpkg')
+
+        ds = ogr.GetDriverByName('GPKG').CreateDataSource(tmpfile)
+        ds.CreateLayer('test', geom_type=ogr.wkbPoint)
+        ds.SetMetadata('FOO', 'BAR')
+        ds = None
+
+        ds = ogr.Open(tmpfile, update=1)
+        gdal.PushErrorHandler()
+        ds.ExecuteSQL('DROP TRIGGER gpkg_metadata_reference_column_name_update')
+        gdal.PopErrorHandler()
+        # inject wrong trigger on purpose
+        wrong_trigger = "CREATE TRIGGER 'gpkg_metadata_reference_column_name_update' " + \
+                        "BEFORE UPDATE OF column_name ON 'gpkg_metadata_reference' " + \
+                        "FOR EACH ROW BEGIN " + \
+                        "SELECT RAISE(ABORT, 'update on table gpkg_metadata_reference " + \
+                        "violates constraint: column name must be NULL when reference_scope " + \
+                        "is \"geopackage\", \"table\" or \"row\"') " + \
+                        "WHERE (NEW.reference_scope IN ('geopackage','table','row') " + \
+                        "AND NEW.column_nameIS NOT NULL); END;"
+        ds.ExecuteSQL(wrong_trigger)
+        ds = None
+
+        vl = QgsVectorLayer(u'{}'.format(tmpfile), 'test', u'ogr')
+        self.assertTrue(vl.isValid())
+        del vl
+
+        # Check trigger afterwards
+        ds = ogr.Open(tmpfile)
+        sql_lyr = ds.ExecuteSQL(
+            "SELECT sql FROM sqlite_master WHERE type = 'trigger' " +
+            "AND name = 'gpkg_metadata_reference_column_name_update'")
+        f = sql_lyr.GetNextFeature()
+        sql = f['sql']
+        ds.ReleaseResultSet(sql_lyr)
+        ds = None
+
+        gdal.Unlink(tmpfile)
+        assert 'column_nameIS' not in sql
+
 
 if __name__ == '__main__':
     unittest.main()