rom pausing before users can connect
      (Tom Lane)
     </P
></LI
><LI
><P
>      Fix SQL grammar to allow subscripting or field selection from a
      sub-SELECT result (Tom Lane)
     </P
></LI
><LI
><P
>      Fix performance problems with autovacuum truncation in busy workloads
      (Jan Wieck)
     </P
><P
>      Truncation of empty pages at the end of a table requires exclusive
      lock, but autovacuum was coded to fail (and release the table lock)
      when there are conflicting lock requests. 