owIndex</code>, keyed by the corresponding column names. If no wrapped data is available, return
 <code>null</code>.
 </p>

 <p>
 If a non-<code>null</code> <code>Map</code> is returned, its behavior must correspond to the contract for a mutable
 <code>Map</code> as described in the JavaDocs for <code>AbstractMap</code>, with the following exceptions and
 specialized behavior:
 </p>
 <ul>

 <li>The <code>Map</code>, and any supporting objects it returns, must perform all column name comparisons in a
 case-i