upport an index on that specific data type, while cross-data-type
   operators and functions are made loose members of the family.
  </p><p>
   You must be a superuser to use <code class="command">ALTER OPERATOR FAMILY</code>.
   (This restriction is made because an erroneous operator family definition
   could confuse or even crash the server.)
  </p><p>
   <code class="command">ALTER OPERATOR FAMILY</code> does not presently check
   whether the operator family definition includes all the operators and
  