[processing] Fix "Add geometry attributes" handling of multipoint geom

For multipoints, export the count of geometries only

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

@@ -115,14 +115,17 @@ def processAlgorithm(self, parameters, context, feedback):
                 new_fields.append(QgsField('straightdis', QVariant.Double))
                 new_fields.append(QgsField('sinuosity', QVariant.Double))
         else:
-            new_fields.append(QgsField('xcoord', QVariant.Double))
-            new_fields.append(QgsField('ycoord', QVariant.Double))
-            if QgsWkbTypes.hasZ(source.wkbType()):
-                self.export_z = True
-                new_fields.append(QgsField('zcoord', QVariant.Double))
-            if QgsWkbTypes.hasM(source.wkbType()):
-                self.export_m = True
-                new_fields.append(QgsField('mvalue', QVariant.Double))
+            if QgsWkbTypes.isMultiType(source.wkbType()):
+                new_fields.append(QgsField('numparts', QVariant.Int))
+            else:
+                new_fields.append(QgsField('xcoord', QVariant.Double))
+                new_fields.append(QgsField('ycoord', QVariant.Double))
+                if QgsWkbTypes.hasZ(source.wkbType()):
+                    self.export_z = True
+                    new_fields.append(QgsField('zcoord', QVariant.Double))
+                if QgsWkbTypes.hasM(source.wkbType()):
+                    self.export_m = True
+                    new_fields.append(QgsField('mvalue', QVariant.Double))
 
         fields = QgsProcessingUtils.combineFields(fields, new_fields)
         (sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
@@ -178,21 +181,18 @@ def processAlgorithm(self, parameters, context, feedback):
         return {self.OUTPUT: dest_id}
 
     def point_attributes(self, geometry):
-        pt = None
+        attrs = []
         if not geometry.isMultipart():
             pt = geometry.constGet()
-        else:
-            if geometry.numGeometries() > 0:
-                pt = geometry.geometryN(0)
-        attrs = []
-        if pt:
             attrs.append(pt.x())
             attrs.append(pt.y())
             # add point z/m
             if self.export_z:
                 attrs.append(pt.z())
             if self.export_m:
                 attrs.append(pt.m())
+        else:
+            attrs = [geometry.constGet().numGeometries()]
         return attrs
 
     def line_attributes(self, geometry):

python/plugins/processing/tests/testdata/expected/add_geometry_info_multipoint.gml

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ogr:FeatureCollection
+     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+     xsi:schemaLocation="http://ogr.maptools.org/ add_geometry_info_multipoint.xsd"
+     xmlns:ogr="http://ogr.maptools.org/"
+     xmlns:gml="http://www.opengis.net/gml">
+  <gml:boundedBy>
+    <gml:Box>
+      <gml:coord><gml:X>0</gml:X><gml:Y>-5</gml:Y></gml:coord>
+      <gml:coord><gml:X>8</gml:X><gml:Y>3</gml:Y></gml:coord>
+    </gml:Box>
+  </gml:boundedBy>
+
+  <gml:featureMember>
+    <ogr:add_geometry_info_multipoint fid="points.9">
+      <ogr:d>5</ogr:d>
+      <ogr:numparts xsi:nil="true"/>
+    </ogr:add_geometry_info_multipoint>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:add_geometry_info_multipoint fid="points.0">
+      <ogr:geometryProperty><gml:MultiPoint srsName="EPSG:4326"><gml:pointMember><gml:Point><gml:coordinates>1,1</gml:coordinates></gml:Point></gml:pointMember><gml:pointMember><gml:Point><gml:coordinates>2,2</gml:coordinates></gml:Point></gml:pointMember><gml:pointMember><gml:Point><gml:coordinates>3,3</gml:coordinates></gml:Point></gml:pointMember></gml:MultiPoint></ogr:geometryProperty>
+      <ogr:d>1</ogr:d>
+      <ogr:numparts>3</ogr:numparts>
+    </ogr:add_geometry_info_multipoint>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:add_geometry_info_multipoint fid="points.3">
+      <ogr:geometryProperty><gml:MultiPoint srsName="EPSG:4326"><gml:pointMember><gml:Point><gml:coordinates>5,2</gml:coordinates></gml:Point></gml:pointMember><gml:pointMember><gml:Point><gml:coordinates>4,1</gml:coordinates></gml:Point></gml:pointMember></gml:MultiPoint></ogr:geometryProperty>
+      <ogr:d>2</ogr:d>
+      <ogr:numparts>2</ogr:numparts>
+    </ogr:add_geometry_info_multipoint>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:add_geometry_info_multipoint fid="points.5">
+      <ogr:geometryProperty><gml:MultiPoint srsName="EPSG:4326"><gml:pointMember><gml:Point><gml:coordinates>0,-5</gml:coordinates></gml:Point></gml:pointMember><gml:pointMember><gml:Point><gml:coordinates>8,-1</gml:coordinates></gml:Point></gml:pointMember></gml:MultiPoint></ogr:geometryProperty>
+      <ogr:d>3</ogr:d>
+      <ogr:numparts>2</ogr:numparts>
+    </ogr:add_geometry_info_multipoint>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:add_geometry_info_multipoint fid="points.7">
+      <ogr:geometryProperty><gml:MultiPoint srsName="EPSG:4326"><gml:pointMember><gml:Point><gml:coordinates>7,-1</gml:coordinates></gml:Point></gml:pointMember><gml:pointMember><gml:Point><gml:coordinates>0,-1</gml:coordinates></gml:Point></gml:pointMember></gml:MultiPoint></ogr:geometryProperty>
+      <ogr:d>4</ogr:d>
+      <ogr:numparts>2</ogr:numparts>
+    </ogr:add_geometry_info_multipoint>
+  </gml:featureMember>
+</ogr:FeatureCollection>

python/plugins/processing/tests/testdata/expected/add_geometry_info_multipoint.xsd

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xs:schema targetNamespace="http://ogr.maptools.org/" xmlns:ogr="http://ogr.maptools.org/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:gml="http://www.opengis.net/gml" elementFormDefault="qualified" version="1.0">
+<xs:import namespace="http://www.opengis.net/gml" schemaLocation="http://schemas.opengis.net/gml/2.1.2/feature.xsd"/>
+<xs:element name="FeatureCollection" type="ogr:FeatureCollectionType" substitutionGroup="gml:_FeatureCollection"/>
+<xs:complexType name="FeatureCollectionType">
+  <xs:complexContent>
+    <xs:extension base="gml:AbstractFeatureCollectionType">
+      <xs:attribute name="lockId" type="xs:string" use="optional"/>
+      <xs:attribute name="scope" type="xs:string" use="optional"/>
+    </xs:extension>
+  </xs:complexContent>
+</xs:complexType>
+<xs:element name="add_geometry_info_multipoint" type="ogr:add_geometry_info_multipoint_Type" substitutionGroup="gml:_Feature"/>
+<xs:complexType name="add_geometry_info_multipoint_Type">
+  <xs:complexContent>
+    <xs:extension base="gml:AbstractFeatureType">
+      <xs:sequence>
+        <xs:element name="geometryProperty" type="gml:MultiPointPropertyType" nillable="true" minOccurs="0" maxOccurs="1"/>
+        <xs:element name="d" nillable="true" minOccurs="0" maxOccurs="1">
+          <xs:simpleType>
+            <xs:restriction base="xs:integer">
+              <xs:totalDigits value="10"/>
+            </xs:restriction>
+          </xs:simpleType>
+        </xs:element>
+        <xs:element name="numparts" nillable="true" minOccurs="0" maxOccurs="1">
+          <xs:simpleType>
+            <xs:restriction base="xs:integer">
+              <xs:totalDigits value="10"/>
+            </xs:restriction>
+          </xs:simpleType>
+        </xs:element>
+      </xs:sequence>
+    </xs:extension>
+  </xs:complexContent>
+</xs:complexType>
+</xs:schema>

python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml

@@ -1574,6 +1574,18 @@ tests:
         name: expected/export_multiline_info.gml
         type: vector
 
+  - algorithm: qgis:exportaddgeometrycolumns
+    name: Export multipoint info
+    params:
+      CALC_METHOD: 0
+      INPUT:
+        name: multipoints.gml|layername=multipoints
+        type: vector
+    results:
+      OUTPUT:
+        name: expected/add_geometry_info_multipoint.gml
+        type: vector
+
   - algorithm: qgis:texttofloat
     name: Text to float
     params: