pecified by:</span></dt>
<dd><code><a href="../../../../io/delta/standalone/expressions/Expression.html#references--">references</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../io/delta/standalone/expressions/Expression.html" title="interface in io.delta.standalone.expressions">Expression</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the names of columns referenced by this expression.</dd>
</dl>
</li>
</ul>
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