Keep join field when using processing/qgis

[qgib]

Author Name: Nicolas Rochard (Nicolas Rochard)
Original Redmine Issue: 12893

Redmine category:processing/qgis

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For try to reduce action to exported physical table.
I wish processing algorithms keep join field when they exist.

Example : Join layer with attribute from table file (posgresql, csv or dbf)
Processing > Dissolve in memory layer or temporary file lost all attribute from table and keep only geometric layer attribute.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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what tool you used to do the dissolve? In processing there are tools (saga,grass,ogr) that don't know anything about qgis joins: processing "simply" call them and they go pick the datasource. Maybe this would be possible with qgis tools.

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• status_id was changed from Open to Feedback
• category_id was configured as Processing/Core

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• category_id was changed from Processing/Core to Processing/QGIS

[qgib]

Author Name: Nicolas Rochard (Nicolas Rochard)

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Giovanni Manghi wrote:

what tool you used to do the dissolve? In processing there are tools (saga,grass,ogr) that don't know anything about qgis joins: processing "simply" call them and they go pick the datasource. Maybe this would be possible with qgis tools.

Yes I mean only about QGIS tools of course.
For Dissolve or Save Selected Features it's QGIS tool in Processing.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• subject was changed from Keep join field when using processing to Keep join field when using processing/qgis
• status_id was changed from Feedback to Open

[qgib]

Author Name: Alexander Bruy (@alexbruy)

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Not sure if we should change current situation. It may be quite confusing for users that some algs (e.g. QGIS) preserver joined/virtual fiels while other algs (based on 3rd party tools) don't.

I started discussion about this in mailing list http://lists.osgeo.org/pipermail/qgis-user/2016-April/036018.html

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• status_id was changed from Open to Feedback

[qgib]

Author Name: Alexander Bruy (@alexbruy)

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We decided to leave this as is, so all Processing algs behave consistent

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• resolution was changed from to wontfix
• status_id was changed from Feedback to Rejected