1 = b.b1 where a.a1 = 42 ...</TT
>
     </P
></LI
><LI
><P
>      Improve optimizer's handling of long <TT
CLASS="LITERAL"
>IN</TT
> lists (Tom)
     </P
><P
>      This change avoids wasting large amounts of time on such lists
      when constraint exclusion is enabled.
     </P
></LI
><LI
><P
>      Prevent synchronous scan during GIN index build (Tom)
     </P
><P
>      Because GIN is optimized for inserting tuples in increasing TID order,
      choosing to use a synchronous scan could slow the build by