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Short-circuit for empty layers

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uclaros 2021-10-25 17:30:13 +03:00 committed by Nyall Dawson
parent de44380637
commit 7b5cd9bcd3
1 changed files with 10 additions and 2 deletions
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12
src/analysis/processing/qgsalgorithmextractbylocation.cpp
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@ -83,9 +83,17 @@ void QgsLocationBasedAlgorithm::process( const QgsProcessingContext &context, Qg
QgsProcessingFeedback *feedback, QgsProcessingFeedback *feedback,
const QgsFeatureIds &skipTargetFeatureIds ) const QgsFeatureIds &skipTargetFeatureIds )
{ {
// skip if there are no features to select from!
if ( targetSource->featureCount() == 0 )
return;
if ( targetSource->featureCount() > 0 && intersectSource->featureCount() > 0 // skip if intersect layer is empty, unless we are looking for disjoints
&& targetSource->featureCount() < intersectSource->featureCount() ) if ( intersectSource->featureCount() == 0 &&
!selectedPredicates.contains( Disjoint ) )
return;
if ( targetSource->featureCount() > 0 && intersectSource->featureCount() > 0 &&
targetSource->featureCount() < intersectSource->featureCount() )
{ {
// joining FEWER features to a layer with MORE features. So we iterate over the FEW features and find matches from the MANY // joining FEWER features to a layer with MORE features. So we iterate over the FEW features and find matches from the MANY
processByIteratingOverTargetSource( context, targetSource, intersectSource, processByIteratingOverTargetSource( context, targetSource, intersectSource,