f bitmap-scan plan
        types. The default is <TT
CLASS="LITERAL"
>on</TT
>.
       </P
></DD
><DT
><A
NAME="GUC-ENABLE-HASHAGG"
></A
><TT
CLASS="VARNAME"
>enable_hashagg</TT
> (<TT
CLASS="TYPE"
>boolean</TT
>)</DT
><DD
><P
>        Enables or disables the query planner's use of hashed
        aggregation plan types. The default is <TT
CLASS="LITERAL"
>on</TT
>.
       </P
></DD
><DT
><A
NAME="GUC-ENABLE-HASHJOIN"
></A
><TT
CLASS="VARNAME"
>enable_hashjoin</TT
> (<TT
CLASS="TYPE"
>boolean</TT
>)</DT
><DD