Bug report #8232: QgsVectorDataProvider.uniqueValues() crash if there is a NULL value in selected index field - QGIS Application - QGIS Issue Tracking

Bug report #8232

QgsVectorDataProvider.uniqueValues() crash if there is a NULL value in selected index field

Added by Daniel Vaz over 11 years ago. Updated over 11 years ago.

Status:	Closed
Priority:	High
Assignee:	-
Category:	Vectors
Affected QGIS version:	master	Regression?:	No
Operating System:	Linux	Easy fix?:	No
Pull Request or Patch supplied:	No	Resolution:	up-/downstream
Crashes QGIS or corrupts data:	No	Copied to github as #:	17044

Description

If there are NULL values in field of a shapefile, the python Qgis API method

QgsVectorDataProvider.uniqueValues

raises a segmentation fault.

There is sample dataset attached and a python standalone minimal application that shows the bug.

polygons.zip (1.91 KB) Daniel Vaz, 2013-07-07 08:11 AM

test_qgsvectordataprovider.py (488 Bytes) Daniel Vaz, 2013-07-07 08:11 AM

bug8232.cpp (807 Bytes) Daniel Vaz, 2013-07-07 03:02 PM

Associated revisions

Revision bf1d1b04
Added by Jürgen Fischer over 11 years ago

ogr provider: avoid GDAL #4509 (fixes #8232)

History

#1 Updated by Daniel Vaz over 11 years ago

This bug was found while attempt to solve the bug #8219.

#2 Updated by Daniel Vaz over 11 years ago

File bug8232.cpp added

The main cause is underlying c++ code. The following code attached shows the bug in c++

#3 Updated by Jürgen Fischer over 11 years ago

Resolution set to up-/downstream

apparently a GDAL/OGR problem:

$ ogrinfo -sql 'SELECT DISTINCT "name" FROM "polygons" ORDER BY name ASC' .
INFO: Open of `.'
      using driver `ESRI Shapefile' successful.

Layer name: polygons
Geometry: Polygon
Segmentation fault (core dumped)

#4 Updated by Jürgen Fischer over 11 years ago

Subject changed from Python API QgsVectorDataProvider.uniqueValues() crash if there is a NULL value in selected index field to QgsVectorDataProvider.uniqueValues() crash if there is a NULL value in selected index field