ogr provider: actually only use relevant fields in feature iterator (fixes #9062)

Author: jef-n

src/providers/ogr/qgsogrfeatureiterator.cpp

@@ -91,7 +91,7 @@ void QgsOgrFeatureIterator::ensureRelevantFields()
 {
   mFetchGeometry = ( mRequest.filterType() == QgsFeatureRequest::FilterRect ) || !( mRequest.flags() & QgsFeatureRequest::NoGeometry );
   QgsAttributeList attrs = ( mRequest.flags() & QgsFeatureRequest::SubsetOfAttributes ) ? mRequest.subsetOfAttributes() : P->attributeIndexes();
-  P->setRelevantFields( mFetchGeometry, attrs );
+  P->setRelevantFields( ogrLayer, mFetchGeometry, attrs );
   P->mRelevantFieldsForNextFeature = true;
 }
 

src/providers/ogr/qgsogrprovider.cpp

@@ -555,7 +555,7 @@ QStringList QgsOgrProvider::subLayers() const
       // Count features for geometry types
       QMap<OGRwkbGeometryType, int> fCount;
       // TODO: avoid reading attributes, setRelevantFields cannot be called here because it is not constant
-      //setRelevantFields( true, QgsAttributeList() );
+      //setRelevantFields( ogrLayer, true, QgsAttributeList() );
       OGR_L_ResetReading( layer );
       OGRFeatureH fet;
       while (( fet = OGR_L_GetNextFeature( layer ) ) )
@@ -714,7 +714,7 @@ QString QgsOgrProvider::storageType() const
   return ogrDriverName;
 }
 
-void QgsOgrProvider::setRelevantFields( bool fetchGeometry, const QgsAttributeList &fetchAttributes )
+void QgsOgrProvider::setRelevantFields( OGRLayerH ogrLayer, bool fetchGeometry, const QgsAttributeList &fetchAttributes )
 {
 #if defined(GDAL_VERSION_NUM) && GDAL_VERSION_NUM >= 1800
   if ( OGR_L_TestCapability( ogrLayer, OLCIgnoreFields ) )
@@ -972,7 +972,7 @@ bool QgsOgrProvider::addFeature( QgsFeature& f )
 
 bool QgsOgrProvider::addFeatures( QgsFeatureList & flist )
 {
-  setRelevantFields( true, attributeIndexes() );
+  setRelevantFields( ogrLayer, true, attributeIndexes() );
 
   bool returnvalue = true;
   for ( QgsFeatureList::iterator it = flist.begin(); it != flist.end(); ++it )
@@ -1074,7 +1074,7 @@ bool QgsOgrProvider::changeAttributeValues( const QgsChangedAttributesMap & attr
 
   clearMinMaxCache();
 
-  setRelevantFields( true, attributeIndexes() );
+  setRelevantFields( ogrLayer, true, attributeIndexes() );
 
   for ( QgsChangedAttributesMap::const_iterator it = attr_map.begin(); it != attr_map.end(); ++it )
   {
@@ -1170,7 +1170,7 @@ bool QgsOgrProvider::changeGeometryValues( QgsGeometryMap & geometry_map )
   OGRFeatureH theOGRFeature = 0;
   OGRGeometryH theNewGeometry = 0;
 
-  setRelevantFields( true, attributeIndexes() );
+  setRelevantFields( ogrLayer, true, attributeIndexes() );
 
   for ( QgsGeometryMap::iterator it = geometry_map.begin(); it != geometry_map.end(); ++it )
   {
@@ -2382,7 +2382,7 @@ void QgsOgrProvider::recalculateFeatureCount()
   {
     featuresCounted = 0;
     OGR_L_ResetReading( ogrLayer );
-    setRelevantFields( true, QgsAttributeList() );
+    setRelevantFields( ogrLayer, true, QgsAttributeList() );
     OGR_L_ResetReading( ogrLayer );
     OGRFeatureH fet;
     while (( fet = OGR_L_GetNextFeature( ogrLayer ) ) )

src/providers/ogr/qgsogrprovider.h

@@ -270,7 +270,7 @@ class QgsOgrProvider : public QgsVectorDataProvider
     void recalculateFeatureCount();
 
     /** tell OGR, which fields to fetch in nextFeature/featureAtId (ie. which not to ignore) */
-    void setRelevantFields( bool fetchGeometry, const QgsAttributeList& fetchAttributes );
+    void setRelevantFields( OGRLayerH ogrLayer, bool fetchGeometry, const QgsAttributeList& fetchAttributes );
 
     /** convert a QgsField to work with OGR */
     static bool convertField( QgsField &field, const QTextCodec &encoding );