Portal SPI_cursor_open_with_args(const char *name,
                                 const char *command,
                                 int nargs, Oid *argtypes,
                                 Datum *values, const char *nulls,
                                 bool read_only, int cursorOptions)   SPI_cursor_open_with_args sets up a cursor
   (internally, a portal) that will execute the specified query.
   Most of the parameters have the same meanings as the corresponding
   parameters to SPI_prepare_cursor
   and SPI_cursor_open.
  
   For one-time query execution, this function should be preferred
   over SPI_prepare_cursor followed by
   SPI_cursor_open.
   If the same command is to be executed with many different parameters,
   either method might be faster, depending on the cost of re-planning
   versus the benefit of custom plans.
  
The passed-in parameter data will be copied into the cursor's portal, so it can be freed while the cursor still exists.
name for portal, or NULL to let the system select a name
command string
number of input parameters ($1, $2, etc.)
an array of length nargs, containing the OIDs of the data types of the parameters
an array of length nargs, containing the actual parameter values
an array of length nargs, describing which parameters are null
      If nulls is NULL then
      SPI_cursor_open_with_args assumes that no parameters
      are null.  Otherwise, each entry of the nulls
      array should be ' ' if the corresponding parameter
      value is non-null, or 'n' if the corresponding parameter
      value is null.  (In the latter case, the actual value in the
      corresponding values entry doesn't matter.)  Note
      that nulls is not a text string, just an array:
      it does not need a '\0' terminator.
     
true for read-only execution
integer bit mask of cursor options; zero produces default behavior