Processing Refactor fields: can't change an "int" field to "double" with 0 precision

[qgib]

Author Name: Filipe Dias (@fsdias)
Original Redmine Issue: 12171
Affected QGIS version: master
Redmine category:data_provider/ogr

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Steps to reproduce:

• Run Refactor fields using the attached shapefile

• Go to field "Nt", change its type to "double" and set Precision to 0

• The new field still has "Nt" as "int". If the Precision is changed to 1 or more, it works.

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• sample.zip (Filipe Dias)

[qgib]

Author Name: Arnaud Morvan (@arnaud-morvan)

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FieldsMapper use standard processing function "output.getVectorWriter" to create output storage, and give it selected type and precision.
With type double and precision 0, I confirm that resulting field is displayed as integer in fields tab of layer properties dialog.

[qgib]

Author Name: Victor Olaya (@volaya)

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IS this a Processing issue or a QGIS one? Processing just passes the precision value to the QgsField object, and it seems that QGIs is not handling it as it should

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• status_id was changed from Open to Feedback

[qgib]

Author Name: Giovanni Manghi (@gioman)

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Still true on master, please change the category if it is a QGIS issue rather than a Processing one.

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• status_id was changed from Feedback to Open

[qgib]

Author Name: Alexander Bruy (@alexbruy)

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This is not a Processing bug and even not QGIS one. Seems GDAL does not allow to create float fields with zero precision

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• assigned_to_id removed Victor Olaya
• category_id was changed from Processing/QGIS to Data Provider/OGR

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• regression was configured as 0
• easy_fix was configured as 0

[qgib]

Author Name: Giovanni Manghi (@gioman)

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End of life notice: QGIS 2.18 LTR

Source:
http://blog.qgis.org/2019/03/09/end-of-life-notice-qgis-2-18-ltr/

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• status_id was changed from Open to Closed
• resolution was changed from to end of life