Bug report #21519

Processing "Build virtual vector" now fails in certain cases

Added by Alister Hood 8 months ago. Updated 5 months ago.

Status:Open
Priority:High
Assignee:Victor Olaya
Category:Processing/QGIS
Affected QGIS version:3.6.0 Regression?:Yes
Operating System: Easy fix?:No
Pull Request or Patch supplied:No Resolution:
Crashes QGIS or corrupts data:No Copied to github as #:29336

Description

1. In 3.x, if I load shape files as directories (i.e. drag and drop the containing directory into QGIS, rather than the shapefile itself), and then try to use those layers as inputs, I get an error message:

Traceback (most recent call last):
File "C:/PROGRA~1/QGIS3~1.6/apps/qgis/./python/plugins\processing\algs\qgis\Datasources2Vrt.py", line 102, in processAlgorithm
feedback=feedback)
File "C:/PROGRA~1/QGIS3~1.6/apps/qgis/./python/plugins\processing\algs\qgis\Datasources2Vrt.py", line 133, in mergeDataSources2Vrt
self.tr('Invalid datasource: {}'.format(inFile)))
_core.QgsProcessingException: Invalid datasource: //path_obfuscated/Area_2/BD34_0109|layername=BD34_0109

Execution failed after 0.10 seconds

It succeeds without error in 2.18.x.

2. If two of the input layers have the same name and I create a "unioned" VRT using 3.x the vrt contains one of them twice and omits the other one. 2.18.x correctly creates a vrt containing both.

3. There is another buglet that isn't a regression as 2.18.x did not support loading the output file after creating it: run the algorithm with 'create "unioned" VRT' unchecked and "open output file after running algorithm" checked, and only one layer in the output VRT will be loaded. However, the VRT was actually created correctly (drag and drop the VRT into QGIS and you will get the dialog to select which layers to load).

History

#1 Updated by Giovanni Manghi 8 months ago

  • Subject changed from Regressions in "Build virtual vector" to Processing "Build virtual vector" does not work anymore
  • Priority changed from Normal to High

#2 Updated by Alister Hood 8 months ago

Subject changed from Regressions in "Build virtual vector" to Processing "Build virtual vector" does not work anymore

I don't really see how that subject is an improvement - it does work mostly, just not in 2 relatively unusual circumstances.

#3 Updated by Giovanni Manghi 8 months ago

I don't really see how that subject is an improvement - it does work mostly, just not in 2 relatively unusual circumstances.

?

#4 Updated by Alister Hood 7 months ago

  • Subject changed from Processing "Build virtual vector" does not work anymore to Processing "Build virtual vector" now fails in certain cases
  • Description updated (diff)

#5 Updated by Victor Olaya 5 months ago

  • Assignee set to Victor Olaya

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