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{
"name": "close_line",
"type": "function",
"groups": ["GeometryGroup"],
"description": "Returns a closed line string of the input line string by appending the first point to the end of the line, if it is not already closed. If the geometry is not a line string or multi line string then the result will be NULL.",
"arguments": [{
"arg": "geometry",
"description": "a line string geometry"
}],
"examples": [{
"expression": "geom_to_wkt(close_line(geom_from_wkt('LINESTRING(0 0, 1 0, 1 1)')))",
"returns": "'LineString (0 0, 1 0, 1 1, 0 0)'"
}, {
"expression": "geom_to_wkt(close_line(geom_from_wkt('LINESTRING(0 0, 1 0, 1 1, 0 0)')))",
"returns": "'LineString (0 0, 1 0, 1 1, 0 0)'"
}],
"tags": ["first", "point", "closed", "end", "input", "appending", "result", "line", "multi"]
}