QGIS/resources/function_help/json/is_empty

{
  "name": "is_empty",
  "type": "function",
  "description": "Returns true if a geometry is empty (without coordinates), false if the geometry is not empty and NULL if there is no geometry. See also `is_empty_or_null`.",
  "arguments": [ {"arg":"geom","description":"a geometry"}],
  "examples": [ { "expression":"is_empty(geom_from_wkt('LINESTRING(0 0, 1 1, 2 2)'))", "returns":"false"},
                { "expression":"is_empty(geom_from_wkt('LINESTRING EMPTY'))", "returns":"true"},
                { "expression":"is_empty(geom_from_wkt('POINT(7 4)'))", "returns":"false"},
                { "expression":"is_empty(geom_from_wkt('POINT EMPTY'))", "returns":"true"} ]
}