{
  "name": "union",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Returns a geometry that represents the point set union of the geometries.",
  "arguments": [{
    "arg": "geometry1",
    "description": "a geometry"
  }, {
    "arg": "geometry2",
    "description": "a geometry"
  }],
  "examples": [{
    "expression": "geom_to_wkt( union( make_point(4, 4), make_point(5, 5) ) )",
    "returns": "'MULTIPOINT(4 4, 5 5)'"
  }],
  "tags": ["union", "dissolve", "point", "represents", "set"]
}