public NumberExpression<Double> length() {
        if (length == null) {
            length = Expressions.numberOperation(Double.class, SpatialOps.LENGTH, mixin);
        }
        return length;
    }
The Length of this MultiCurve which is equal to the sum of the lengths of the element
Curves.

@return length
querydsl-spatial/src/main/java/com/querydsl/spatial/locationtech/jts/JTSMultiCurveExpression.java