Display of NULL values of attributes of type INTEGER not correct when coming from WFS

[qgib]

Author Name: Manuel K (Manuel K)
Original Redmine Issue: 18674
Affected QGIS version: 3.0.0
Redmine category:web_services_clients/wfs

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NULL Values of attributes of type INT are incorrectly displayed as "0" instead of the representation for NULL values defined in the Settings/Options Dialog.

http://go.geozug.ch/Zug_WFS_Baumkataster/service.svc/get?SERVICE=WFS&VERSION=2.0.0&REQUEST=DescribeFeatureType&TYPENAME=Baumkataster_ZugType

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• null_value_int.png (Manuel K)
• snapshot_qgis3.1.png (Even Rouault)
• snip_20181122145131.png (Frode Hansen)

[qgib]

Author Name: Even Rouault (@rouault)

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I can't reproduce with QGIS 3.1. The NULL values are properly displayed. See snapshot_qgis3.1.png

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• 12760 was configured as snapshot_qgis3.1.png

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• snapshot_qgis3.1.png (Even Rouault)

[qgib]

Author Name: Even Rouault (@rouault)

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• resolution was changed from to worksforme
• status_id was changed from Open to Closed

[qgib]

Author Name: Frode Hansen (Frode Hansen)

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Using qgis 3.4.1, when displaying attributes of type INT via WFS 1.1.0, NULL values is displayed as "0". WFS does not transmit nodes with null values, and qgis should not interpret these as "0". Reproduced both in qgis 2.18.25 (LTS) and 3.4.1 on different machines here.

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• 13830 was configured as snip_20181122145131.png

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• snip_20181122145131.png (Frode Hansen)