@Override
    public FixedWidthBucketFunctionNode clone() {
        FixedWidthBucketFunctionNode obj = (FixedWidthBucketFunctionNode)super.clone();
        if (width != null) {
            obj.width = (NumericResultNode)width.clone();
        }
        return obj;
    }
Obtain the width of this bucket expression

@return bucket width for this expression
searchlib/src/main/java/com/yahoo/searchlib/expression/FixedWidthBucketFunctionNode.java