$rownum (and possibly other functions) do not work on virtual fields

[qgib]

Author Name: Giovanni Manghi (@gioman)
Original Redmine Issue: 19431
Affected QGIS version: 3.3(master)
Redmine category:field_calculator

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It always return "0".

Another example is "count", which returns always NULL.

Tested on LTR and master.

On non virtual fields are ok.

[qgib]

Author Name: Luigi Pirelli (@luipir)

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confirmed on master an 2.18 LTR

[qgib]

Author Name: Luigi Pirelli (@luipir)

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rownumber is filled here
https://github.com/qgis/QGIS/blob/master/src/app/qgsfieldcalculator.cpp#L274

but completly skipped here
https://github.com/qgis/QGIS/blob/master/src/app/qgsfieldcalculator.cpp#L197 in case of virtualfields

probably a simple if reorganization would solve... investigating more

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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It's deliberately not exposed here, because it has no meaning outside of the field calculator (since virtual fields are "global" for a layer, yet the layer may be opened in two different attribute table dialogs both with different sort orders). Use $id instead.

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