[processing] Fix intersection and union tools don't work with

input layers with Z or M values present

Also ensure that written geometries are always multitype, to
match the created layer geometry type (before the layer was
being created as a multi* layer, but single part geometries
were sometimes created. This causes errors with some data
providers)

python/plugins/processing/algs/qgis/Intersection.py

@@ -46,15 +46,6 @@
 
 pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
 
-wkbTypeGroups = {
-    'Point': (QgsWkbTypes.Point, QgsWkbTypes.MultiPoint, QgsWkbTypes.Point25D, QgsWkbTypes.MultiPoint25D,),
-    'LineString': (QgsWkbTypes.LineString, QgsWkbTypes.MultiLineString, QgsWkbTypes.LineString25D, QgsWkbTypes.MultiLineString25D,),
-    'Polygon': (QgsWkbTypes.Polygon, QgsWkbTypes.MultiPolygon, QgsWkbTypes.Polygon25D, QgsWkbTypes.MultiPolygon25D,),
-}
-for key, value in list(wkbTypeGroups.items()):
-    for const in value:
-        wkbTypeGroups[const] = key
-
 
 class Intersection(QgisAlgorithm):
 
@@ -186,7 +177,8 @@ def processAlgorithm(self, parameters, context, feedback):
                                     'more input features have invalid '
                                     'geometry.'))
                     try:
-                        if int_geom.wkbType() in wkbTypeGroups[wkbTypeGroups[int_geom.wkbType()]]:
+                        if QgsWkbTypes.geometryType(int_geom.wkbType()) == QgsWkbTypes.geometryType(geomType):
+                            int_geom.convertToMultiType()
                             outFeat.setGeometry(int_geom)
                             outFeat.setAttributes(out_attributes)
                             sink.addFeature(outFeat, QgsFeatureSink.FastInsert)

python/plugins/processing/algs/qgis/Union.py

@@ -44,15 +44,6 @@
 
 pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
 
-wkbTypeGroups = {
-    'Point': (QgsWkbTypes.Point, QgsWkbTypes.MultiPoint, QgsWkbTypes.Point25D, QgsWkbTypes.MultiPoint25D,),
-    'LineString': (QgsWkbTypes.LineString, QgsWkbTypes.MultiLineString, QgsWkbTypes.LineString25D, QgsWkbTypes.MultiLineString25D,),
-    'Polygon': (QgsWkbTypes.Polygon, QgsWkbTypes.MultiPolygon, QgsWkbTypes.Polygon25D, QgsWkbTypes.MultiPolygon25D,),
-}
-for key, value in list(wkbTypeGroups.items()):
-    for const in value:
-        wkbTypeGroups[const] = key
-
 
 class Union(QgisAlgorithm):
 
@@ -113,6 +104,7 @@ def processAlgorithm(self, parameters, context, feedback):
             intersects = indexB.intersects(geom.boundingBox())
             if len(intersects) < 1:
                 try:
+                    geom.convertToMultiType()
                     outFeat.setGeometry(geom)
                     outFeat.setAttributes(atMapA)
                     sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
@@ -149,6 +141,7 @@ def processAlgorithm(self, parameters, context, feedback):
                                 if i.type() == geom.type():
                                     int_geom = QgsGeometry(i)
                                     try:
+                                        int_geom.convertToMultiType()
                                         outFeat.setGeometry(int_geom)
                                         outFeat.setAttributes(atMapA + atMapB)
                                         sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
@@ -159,8 +152,9 @@ def processAlgorithm(self, parameters, context, feedback):
                             # in geometries of different types
                             # produced by the intersection
                             # fix #3549
-                            if int_geom.wkbType() in wkbTypeGroups[wkbTypeGroups[int_geom.wkbType()]]:
+                            if QgsWkbTypes.geometryType(int_geom.wkbType()) == QgsWkbTypes.geometryType(geomType):
                                 try:
+                                    int_geom.convertToMultiType()
                                     outFeat.setGeometry(int_geom)
                                     outFeat.setAttributes(atMapA + atMapB)
                                     sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
@@ -180,6 +174,7 @@ def processAlgorithm(self, parameters, context, feedback):
                         if i.type() == geom.type():
                             diff_geom = QgsGeometry(i)
                 try:
+                    diff_geom.convertToMultiType()
                     outFeat.setGeometry(diff_geom)
                     outFeat.setAttributes(atMapA)
                     sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
@@ -205,6 +200,7 @@ def processAlgorithm(self, parameters, context, feedback):
 
             if len(intersects) < 1:
                 try:
+                    geom.convertToMultiType()
                     outFeat.setGeometry(geom)
                     outFeat.setAttributes(atMap)
                     sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
@@ -229,6 +225,7 @@ def processAlgorithm(self, parameters, context, feedback):
                         try:
                             # Ihis only happens if the bounding box
                             # intersects, but the geometry doesn't
+                            diff_geom.convertToMultiType()
                             outFeat.setGeometry(diff_geom)
                             outFeat.setAttributes(atMap)
                             sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
@@ -237,6 +234,7 @@ def processAlgorithm(self, parameters, context, feedback):
 
             if add:
                 try:
+                    diff_geom.convertToMultiType()
                     outFeat.setGeometry(diff_geom)
                     outFeat.setAttributes(atMap)
                     sink.addFeature(outFeat, QgsFeatureSink.FastInsert)