{
  "name": "length",
  "type": "function",
  "description": "Returns the number of characters in a string or the length of a geometry linestring.",
  "variants": [
  { "variant": "String variant",
      "variant_description": "Returns the number of characters in a string.",
      "arguments": [ {"arg":"string","description":"string to count length of"} ],
      "examples": [ { "expression":"length('hello')", "returns":"5"} ] },
      {
      "variant": "Geometry variant",
      "variant_description": "Calculate the length of a geometry line object. Calculations are in the Spatial Reference System of this geometry.",
      "arguments": [ {"arg":"geometry","description":"line geometry object"}],
      "examples": [ { "expression":"length(geom_from_wkt('LINESTRING(0 0, 4 0)'))", "returns":"4.0"}]
  }]
}