@Override
    public String asString() {
        double[] value = getValue();
        int len = value == null ? 0 : value.length;
        if (len == 0) {
            return ClickHouseValues.EMPTY_ARRAY_EXPR;
        }

        StringBuilder builder = new StringBuilder().append('[').append(value[0]);
        for (int i = 1; i < len; i++) {
            builder.append(',').append(value[i]);
        }
        return builder.append(']').toString();
    }
Update value of the given object or create a new instance if {@code ref} is
null.

@param ref   object to update, could be null
@param value value
@return same object as {@code ref} or a new instance if it's null
clickhouse-data/src/main/java/com/clickhouse/data/value/array/ClickHouseDoubleArrayValue.java