   furthermore attempt to cache the execution plan associated with any
    particular prepared statement.  If a cached plan is not used, then
    a fresh execution plan is generated on each visit to the statement,
    and the current parameter values (that is, <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
>
    variable values) can be used to optimize the selected plan.  If the
    statement has no parameters, or is executed many times, the SPI manager
    will consider creating a <I
CLASS="FIRSTTERM"
>generic<