QGIS » QGIS Application

create a postgis table like this:

CREATE TABLE public.pipe
(
  id uuid NOT NULL,
  year_end smallint,
  remark text,
  geometry_linez geometry(LineStringZ,21781),
  geometry_curve geometry(MultiCurve,21781),
  geometry_curvez geometry(MultiCurveZ,21781),
  geometrycollection geometry(GeometryCollectionZ,21781),
  CONSTRAINT pipe_pkey PRIMARY KEY (id)
)
WITH (
  OIDS=FALSE
);

open a layer using geometry_curvez geometry

Set default option Z value to anything

Creating a geometry with the curve tool will create nodes with NaN instead of default value.

Saving will crash