default OptionalInt getColumnSize() {
        return getAsInt(HasColumnSizeUtil.COLUMN_SIZE);
    }
Gets the column size of this {@link Document}. If no size is present, 
this method will return an empty {@code OptionalInt}. This should be 
interpreted as no decisions can be made regarding the size of the data.

@return the column size of this {@link Document}
runtime-parent/runtime-config/src/main/java/com/speedment/runtime/config/trait/HasColumnSize.java