<blockquote>
<p>Preserve DatasetMapper object while loading multiple times and add a test for this situation, to ensure that mapping information from a previous load is not destroyed.</p>
</blockquote>

<p>This one I am not sure about what is the result rcurtin refer to either.I guess what he means is we should keep the DatasetMapper mapping results when we load the new data.</p>

<p><a href="https://github.com/rcurtin" class="user-mention">@rcurtin</a> could you post some examples to show us what kind of result you want?</p>

<blockquote>
<p>(I guess this is fundamentally inevitable?)</p>
</blockquote>

<p>I have the same opinion as yours</p>

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