ish an
      <TT
CLASS="REPLACEABLE"
><I
>x</I
></TT
> <TT
CLASS="LITERAL"
>IS NOT NULL</TT
> predicate, for example.
      This fixes a planner regression in 9.2, since previous versions could
      make comparable deductions.
     </P
></LI
><LI
><P
>      Limit growth of planning time when there are many indexable join
      clauses for the same index (Tom Lane)
     </P
></LI
><LI
><P
>      Improve planner's ability to prove exclusion constraints from
      equivalence classes (Tom Lane)
     </P
></LI