Hi Anita, that does not do what Marco is asking for, because you get a 
multipart geometry;

he needs a linestring geometry I think...

Il 22/02/2017 11:10, Anita Graser ha scritto:
Hi Marco,

The Dissolve tool already has a "unique fields" option. It sounds like you are 
reinventing that.

Best wishes,
Anita



On Wed, Feb 22, 2017 at 10:32 AM, Marco Grisolia 
<marco.grisol...@gmail.com<mailto:marco.grisol...@gmail.com>> wrote:
Hi,
I recently answered to a question on GIS StackExchange [0]. In this question, 
the asker was looking for a way for dissolving features using an adjacency 
criterion instead of using common attribute field (please, follow the link 
below for a better understanding). This feature is already available in the 
analogous ArcGIS tool when the"Create multipart features" option is enabled and 
I think it could be of interest having an additional option like this in the 
"Dissolve" tool main dialog for next releases.
I never submitted a feature request on the QGIS Project site but, since there 
is already a (very rough) code and a general idea on how to approach the issue, 
I didn't know if this was the case of adding it there. Otherwise, let me know 
if I need to add it on the QGIS Project site (if this is the case, I'm sorry 
for wasting your time).
Regards,
Marco


[0] http://gis.stackexchange.com/questions/228267/merging-adjacent-lines-in-qgis

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