public int getScale() {
        return scale;
    }
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 UTC date time in string
@param scale scale
@param tz    time zone, null is treated as {@code UTC}
@return same object as {@code ref} or a new instance if it's null
clickhouse-data/src/main/java/com/clickhouse/data/value/ClickHouseInstantValue.java