{
  "name": "straight_distance_2d",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Returns the direct/euclidean distance between the first and last vertex of a geometry. The geometry must be a curve (circularstring, linestring).",
  "arguments": [{
    "arg": "geometry",
    "description": "The geometry."
  }],
  "examples": [{
    "expression": "straight_distance_2d(geom_from_wkt('LINESTRING(1 0, 1 1)'))",
    "returns": "1"
  }, {
    "expression": "round(straight_distance_2d(geom_from_wkt('LINESTRING(1 4, 3 5, 5 0)')), 3)",
    "returns": "5.657"
  }],
  "tags": ["distance", "curve", "circularstring", "first", "last", "direct", "euclidean", "linestring", "vertex"]
}