  an array of length <TT
CLASS="PARAMETER"
>nargs</TT
>, describing which
      parameters are null
     </P
><P
>      If <TT
CLASS="PARAMETER"
>nulls</TT
> is <TT
CLASS="SYMBOL"
>NULL</TT
> then
      <CODE
CLASS="FUNCTION"
>SPI_execute_with_args</CODE
> assumes that no parameters
      are null.  Otherwise, each entry of the <TT
CLASS="PARAMETER"
>nulls</TT
>
      array should be <TT
CLASS="LITERAL"
>'&nbsp;'</TT
> if the corresponding parameter
      value is non-null, or <TT
CLASS="LITERAL"
>'n'</TT
>