title: ARRAYFORMULA() does not work with SPLIT()
body: <p>Why doesn't the split formula get expanded over the entire column when I use <code>=arrayformula(split(input!G2:G, ","))</code> ? </p>
  
  <p>I get result only for the input!G2 cell, but not the rest in the G column. Other formulas like <code>=arrayformula(find(",", input!G2:G))</code> seem to function and get expanded without problems.</p>