Fix QgsFeatureRequest with expression not using provider fields

nyalldawson · nyalldawson · commit cfeeb3fd4b15 · 2016-11-23T13:11:56.000+10:00
and limit (fix #15771) (cherry-picked from 5e3bef7)
diff --git a/src/core/qgsvectorlayerfeatureiterator.cpp b/src/core/qgsvectorlayerfeatureiterator.cpp
@@ -161,6 +161,8 @@ QgsVectorLayerFeatureIterator::QgsVectorLayerFeatureIterator( QgsVectorLayerFeat
       if ( source->mFields.fieldOrigin( idx ) != QgsFields::OriginProvider )
       {
         mProviderRequest.disableFilter();
+        // can't limit at provider side
+        mProviderRequest.setLimit( -1 );
       }
     }
   }

Original file line number	Diff line number	Diff line change
`@@ -161,6 +161,8 @@ QgsVectorLayerFeatureIterator::QgsVectorLayerFeatureIterator( QgsVectorLayerFeat`
`161`	`161`	`if ( source->mFields.fieldOrigin( idx ) != QgsFields::OriginProvider )`
`162`	`162`	`{`
`163`	`163`	`mProviderRequest.disableFilter();`
	`164`	`+ // can't limit at provider side`
	`165`	`+ mProviderRequest.setLimit( -1 );`
`164`	`166`	`}`
`165`	`167`	`}`
`166`	`168`	`}`