tantamount to granting public execute permission on it.  This is usually
   not an issue for the sorts of functions that are useful in an operator
   family.
  </p><p>
   The operators should not be defined by SQL functions.  An SQL function
   is likely to be inlined into the calling query, which will prevent
   the optimizer from recognizing that the query matches an index.
  </p><p>
   Before <span class="productname">PostgreSQL</span> 8.4, the <code class="literal">OPERATOR</code>
   clause could includ