The current behaviour when requesting extra_info is to have one feature per line segment in the output line that has the requested extra_info-values as attributes.
For longer routes, this results in a lot of features.
The intuitive assumption, however, would be that all features where the extra_info attribute combination doesn't change are dissolved into one feature, especially when only requesting one extra_info.
When shorter routes are requested with multiple parameters in extra_info, there are a lot of attribute combinations, so dissolving wouldn't change much.
Additionally, dissolving can be done using QGIS builtin processing tools.
There exist a few different approaches to address this issue:
[Current] do not dissolve and leave the task to the user
Dissolve only when one extra_info is requested. This could even be forced by setting allowMultiple=False on the processing parameter.
Return one layer per requested extra_info and dissolve that
Dissolve on every change of extra_info attribute combination
For every approach, dissolving could be made optional via another parameter.
There might be use cases, where the non-dissolved output is the wanted output, so every dissolve would have to be undone.
The current behaviour when requesting
extra_infois to have one feature per line segment in the output line that has the requestedextra_info-values as attributes.For longer routes, this results in a lot of features. The intuitive assumption, however, would be that all features where the
extra_infoattribute combination doesn't change are dissolved into one feature, especially when only requesting oneextra_info.When shorter routes are requested with multiple parameters in
extra_info, there are a lot of attribute combinations, so dissolving wouldn't change much.Additionally, dissolving can be done using QGIS builtin processing tools.
There exist a few different approaches to address this issue:
extra_infois requested. This could even be forced by settingallowMultiple=Falseon the processing parameter.extra_infoand dissolve thatextra_infoattribute combinationFor every approach, dissolving could be made optional via another parameter.
There might be use cases, where the non-dissolved output is the wanted output, so every dissolve would have to be undone.