Multiple geometry columns

[m-kuhn]

Situation is: additional geometry columns are internally propagated as EKWT (SRID=XXX;WKT)

Proposal: propagate them as QgsGeometry internally and move the CRS information to the field definition.

[nyalldawson]

I would VERY much like to see this, as it would open up lots of possibilities such as:

• rendering symbols based on a different geometry column to the main layer geometry column
• using a different geometry for label paths, see eg https://github.com/qgis/QGIS-Enhancement-Proposals/issues/46

It would also allow us to make the attribute table usable for layers with multiple geometry columns. Currently the conversion to EKWT can result in huge strings, which kill performance in the attribute table.

I would like to see the the attribute table use a special "geometry widget" to display additional geometries - see eg https://github.com/nyalldawson/QGIS/commit/0b14f82b411bc5c68b8cbab49a9a1dfbb86bca65 (more of a proof-of-concept than anything usable - but allows easy copying of geometry as wkt/json and pasting geometries into an existing row, or removing geometries from a row) and http://hub.qgis.org/issues/10283

[haubourg]

+1 !