<dt id="arg-y">y<a class="anchor" aria-label="anchor" href="#arg-y"></a></dt>
<dd><p>an MDB object</p></dd>


<dt id="arg-by">by<a class="anchor" aria-label="anchor" href="#arg-by"></a></dt>
<dd><p>a tibble as returned by the <code><a href="get_shared_collections.html">get_shared_collections()</a></code> function
which indicates which collection members should be merged through
a relational table. If the collection is <code>NA</code>, the relational table is built
by merging identical columns in table.x and