<p>In <a href="https://github.com/dbsrgits/dbix-class/pull/88#discussion_r43768792">lib/DBIx/Class/ResultSource.pm</a>:</p>
<pre style='color:#555'>&gt; @@ -731,6 +762,9 @@ only columns in the constraint are searched.
&gt;  Throws an error if any of the given column names do not yet exist on
&gt;  the result source.
&gt;  
&gt; +Note also that the keys C&lt;table&gt;, C&lt;name&gt;, and C&lt;fields&gt; in
&gt; +C&lt;sqlt_extra&gt; will be ignored.
&gt; +
</pre>
<p>What does this note actually mean...? Please elaborate</p>

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