ST_Extrude of M geometries looses M

[robe]

I'm not sure if this is a bug or anything that can be done about it. At very least we should probably document the behavior that M coordinates are lost during extrude process.

SELECT ST_AsText(ST_Extrude('LINESTRING M (-10 50 1,50 -10 1)'::geometry, 20.1,20.1,20.1) );

This is one of the garden monkey tests which yields:

POLYHEDRALSURFACE Z (((-10 50 0,50 -10 0,70.1 10.1 20.1,10.1 70.1 20.1,-10 50 0)))

[robe]

Still issue with SFCGAL 1.2.0

[robe]

ticketed on SFCGAL at ​https://github.com/Oslandia/SFCGAL/issues/110

[hmercier]

Yes this is a feature we don't know what to do when creating a new M, so we ignore them.