Fix some providers did not respect layer's subset when calculating

min/max/uniqueValues

Providers included delimited text, memory, virtual layer, and WFS

Add unit test to provider test

Author: nyalldawson

src/providers/delimitedtext/qgsdelimitedtextprovider.cpp

@@ -1078,6 +1078,7 @@ bool QgsDelimitedTextProvider::setSubsetString( const QString& subset, bool upda
     }
   }
 
+  mCacheMinMaxDirty = true;
   emit dataChanged();
   return valid;
 }

src/providers/memory/qgsmemoryprovider.cpp

@@ -481,6 +481,7 @@ bool QgsMemoryProvider::setSubsetString( const QString& theSQL, bool updateFeatu
   }
 
   mSubsetString = theSQL;
+  mCacheMinMaxDirty = true;
 
   emit dataChanged();
   return true;

src/providers/virtual/qgsvirtuallayerprovider.cpp

@@ -493,6 +493,7 @@ QString QgsVirtualLayerProvider::subsetString()
 bool QgsVirtualLayerProvider::setSubsetString( const QString& subset, bool updateFeatureCount )
 {
   mSubset = subset;
+  mCacheMinMaxDirty = true;
   if ( updateFeatureCount )
     updateStatistics();
   return true;

src/providers/wfs/qgswfsprovider.cpp

@@ -130,6 +130,7 @@ QString QgsWFSProvider::subsetString()
 bool QgsWFSProvider::setSubsetString( const QString& theSQL, bool updateFeatureCount )
 {
   mSubsetString = theSQL;
+  mCacheMinMaxDirty = true;
 
   // update URI
   mShared->mURI.setFilter( theSQL );

tests/src/python/providertestbase.py

@@ -165,6 +165,10 @@ def getSubsetString(self):
         """Individual providers may need to override this depending on their subset string formats"""
         return '"cnt" > 100 and "cnt" < 410'
 
+    def getSubsetString2(self):
+        """Individual providers may need to override this depending on their subset string formats"""
+        return '"cnt" > 100 and "cnt" < 400'
+
     def testOrderByUncompiled(self):
         try:
             self.disableCompiler()
@@ -359,10 +363,22 @@ def testMinValue(self):
         self.assertEqual(self.provider.minimumValue(1), -200)
         self.assertEqual(self.provider.minimumValue(2), 'Apple')
 
+        subset = self.getSubsetString()
+        self.provider.setSubsetString(subset)
+        min_value = self.provider.minimumValue(1)
+        self.provider.setSubsetString(None)
+        self.assertEqual(min_value, 200)
+
     def testMaxValue(self):
         self.assertEqual(self.provider.maximumValue(1), 400)
         self.assertEqual(self.provider.maximumValue(2), 'Pear')
 
+        subset = self.getSubsetString2()
+        self.provider.setSubsetString(subset)
+        max_value = self.provider.maximumValue(1)
+        self.provider.setSubsetString(None)
+        self.assertEqual(max_value, 300)
+
     def testExtent(self):
         reference = QgsGeometry.fromRect(
             QgsRectangle(-71.123, 66.33, -65.32, 78.3))
@@ -374,6 +390,12 @@ def testUnique(self):
         self.assertEqual(set(self.provider.uniqueValues(1)), set([-200, 100, 200, 300, 400]))
         assert set([u'Apple', u'Honey', u'Orange', u'Pear', NULL]) == set(self.provider.uniqueValues(2)), 'Got {}'.format(set(self.provider.uniqueValues(2)))
 
+        subset = self.getSubsetString2()
+        self.provider.setSubsetString(subset)
+        values = self.provider.uniqueValues(1)
+        self.provider.setSubsetString(None)
+        self.assertEqual(set(values), set([200, 300]))
+
     def testFeatureCount(self):
         assert self.provider.featureCount() == 5, 'Got {}'.format(self.provider.featureCount())
 

tests/src/python/test_provider_wfs.py

@@ -228,6 +228,67 @@ def setUpClass(cls):
   </wfs:member>
 </wfs:FeatureCollection>""")
 
+        with open(sanitize(endpoint, """?SERVICE=WFS&REQUEST=GetFeature&VERSION=2.0.0&TYPENAMES=my:typename&FILTER=<fes:Filter xmlns:fes="http://www.opengis.net/fes/2.0">
+ <fes:And>
+  <fes:PropertyIsGreaterThan>
+   <fes:ValueReference>cnt</fes:ValueReference>
+   <fes:Literal>100</fes:Literal>
+  </fes:PropertyIsGreaterThan>
+  <fes:PropertyIsLessThan>
+   <fes:ValueReference>cnt</fes:ValueReference>
+   <fes:Literal>400</fes:Literal>
+  </fes:PropertyIsLessThan>
+ </fes:And>
+</fes:Filter>
+&RESULTTYPE=hits"""), 'wb') as f:
+            f.write("""
+<wfs:FeatureCollection
+                       xmlns:wfs="http://www.opengis.net/wfs/2.0"
+                       xmlns:gml="http://www.opengis.net/gml/3.2"
+                       numberMatched="2" numberReturned="0" timeStamp="2016-03-25T14:51:48.998Z">
+</wfs:FeatureCollection>""")
+
+        with open(sanitize(endpoint, """?SERVICE=WFS&REQUEST=GetFeature&VERSION=2.0.0&TYPENAMES=my:typename&SRSNAME=urn:ogc:def:crs:EPSG::4326&FILTER=<fes:Filter xmlns:fes="http://www.opengis.net/fes/2.0">
+ <fes:And>
+  <fes:PropertyIsGreaterThan>
+   <fes:ValueReference>cnt</fes:ValueReference>
+   <fes:Literal>100</fes:Literal>
+  </fes:PropertyIsGreaterThan>
+  <fes:PropertyIsLessThan>
+   <fes:ValueReference>cnt</fes:ValueReference>
+   <fes:Literal>400</fes:Literal>
+  </fes:PropertyIsLessThan>
+ </fes:And>
+</fes:Filter>
+"""), 'wb') as f:
+            f.write("""
+<wfs:FeatureCollection
+                       xmlns:wfs="http://www.opengis.net/wfs/2.0"
+                       xmlns:gml="http://www.opengis.net/gml/3.2"
+                       xmlns:my="http://my"
+                       numberMatched="2" numberReturned="2" timeStamp="2016-03-25T14:51:48.998Z">
+  <wfs:member>
+    <my:typename gml:id="typename.1">
+      <gml:boundedBy><gml:Envelope srsName="urn:ogc:def:crs:EPSG::4326"><gml:lowerCorner>70.8 -68.2</gml:lowerCorner><gml:upperCorner>70.8 -68.2</gml:upperCorner></gml:Envelope></gml:boundedBy>
+      <my:geometryProperty><gml:Point srsName="urn:ogc:def:crs:EPSG::4326" gml:id="typename.geom.1"><gml:pos>70.8 -68.2</gml:pos></gml:Point></my:geometryProperty>
+      <my:pk>2</my:pk>
+      <my:cnt>200</my:cnt>
+      <my:name>Apple</my:name>
+      <my:name2>Apple</my:name2>
+      <my:num_char>2</my:num_char>
+    </my:typename>
+  </wfs:member>
+  <wfs:member>
+    <my:typename gml:id="typename.3">
+      <my:pk>3</my:pk>
+      <my:cnt>300</my:cnt>
+      <my:name>Pear</my:name>
+      <my:name2>PEaR</my:name2>
+      <my:num_char>3</my:num_char>
+    </my:typename>
+  </wfs:member>
+</wfs:FeatureCollection>""")
+
     @classmethod
     def tearDownClass(cls):
         """Run after all tests"""