Singleparts to multi-part polygon algorithm uses NULL values also

[qgib]

Author Name: Sharachchandra Lele (Sharachchandra Lele)
Original Redmine Issue: 15822
Affected QGIS version: 2.14.2
Redmine category:processing/qgis

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I have a polygon shapefile with an attribute villageID, in which some polygons have the same attribute value and so they should together form a single multi-part polygon. Some other polygons have NULL in this villageID field. When I run the tool Vector>Geometry Tools>Singleparts to Multipart (from the menu or from Procsesing Toolbox, and whether I use the GDAL version or the QGIS geoalgorithm version), the resulting shapefile does merge the repeated villageIDs into multi-part polygons. But it ALSO merges ALL the polygons that had this field = NULL into a SINGLE multi-part polygon. In effect, it is treating all NULL values as equal, when in fact it should treat NULL as 'not known' and ignore those polygons. If I run a 'find duplicates' query in MS-ACCESS on the attribute table dbf, the query ignores those rows where villageID=NULL, which IMHO is the correct method.

[qgib]

Author Name: Alexander Bruy (@alexbruy)

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• category_id was configured as Processing/QGIS

[qgib]

Author Name: Alexander Bruy (@alexbruy)

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Fixed in a944f7c

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• status_id was changed from Open to Closed
• resolution was changed from to fixed/implemented

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• status_id was changed from Closed to Reopened
• regression was configured as 0
• resolution was changed from fixed/implemented to
• easy_fix was configured as 0

[qgib]

Author Name: Alexander Bruy (@alexbruy)

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Applied in changeset e4d745f.

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• status_id was changed from Reopened to Closed
• done_ratio was changed from 0 to 100

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• resolution was changed from to fixed/implemented