 <TT
CLASS="COMMAND"
>DROP INDEX CONCURRENTLY</TT
> is
      canceled: the previous coding could leave an un-droppable index behind.
     </P
></LI
><LI
><P
>      Correct predicate locking for <TT
CLASS="COMMAND"
>DROP INDEX CONCURRENTLY</TT
>
      (Kevin Grittner)
     </P
><P
>      Previously, SSI predicate locks were processed at the wrong time,
      possibly leading to incorrect behavior of serializable transactions
      executing in parallel with the <TT
CLASS="COMMAND"
>DROP</TT
>.
     </P
></LI