{
  "function": "convex_hull",
  "description": "Returns the convex hull of a geometry. It represents the minimum convex geometry that encloses all geometries within the set.",
  "arguments": [ {"arg":"geometry","description":"a geometry"}],
  "examples": [ { "expression":"geom_to_wkt( combine( geom_from_wkt( 'LINESTRING(3 3, 4 4, 5 5)' ), geom_from_wkt( 'LINESTRING(3 3, 4 4, 2 1)' ) ) )", "returns":"MULTILINESTRING((4 4, 2 1), (3 3, 4 4), (4 4, 5 5))"},
  { "expression":"geom_to_wkt( convex_hull( geom_from_wkt( 'LINESTRING(3 3, 4 4, 4 10)' ) ) )", "returns":"POLYGON((3 3,4 10,4 4,3 3))"}
  ]
}