pan><span class="token operator"> = </span>null</span></span><span class="token punctuation">)</span><span class="token operator">: </span><a href="-lead/index.html">Lead</a><span class="token operator">&lt;</span><a href="lead.html">T</a><span class="token operator">&gt;</span></div><p class="paragraph">Returns value evaluated at the row that is <a href="lead.html">offset</a> rows after the current row within the partition; if there is no such row, instead returns <a href="lead.html">defaultValue</a>. Both