sult.  Smaller values reduce planning time but might
        yield inferior query plans.
       </P
><P
>        By default, this variable is set the same as
        <TT
CLASS="VARNAME"
>from_collapse_limit</TT
>, which is appropriate
        for most uses. Setting it to 1 prevents any reordering of
        explicit <TT
CLASS="LITERAL"
>JOIN</TT
>s. Thus, the explicit join order
        specified in the query will be the actual order in which the
        relations are joined. Because the query planner does 