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Fix Virtual layers display with empty subsetstring
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Fixes #19721

Virtual layers incorrectly show no feature when the expression filter string is empty, instead of correctly showing all the features.

Subset string needs to be tested against Empty instead of Null in order to correctly populate the wheres list and prepare a well formed SQL query string.
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agiudiceandrea authored and nyalldawson committed Aug 28, 2018
1 parent 65f4bf1 commit 99696b6
Showing 1 changed file with 1 addition and 1 deletion.
2 changes: 1 addition & 1 deletion src/providers/virtual/qgsvirtuallayerfeatureiterator.cpp
Expand Up @@ -65,7 +65,7 @@ QgsVirtualLayerFeatureIterator::QgsVirtualLayerFeatureIterator( QgsVirtualLayerF
QStringList wheres;
QString offset;
QString subset = mSource->mSubset;
if ( !subset.isNull() )
if ( !subset.isEmpty() )
wheres << subset;
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