SPI_getargtypeid
Name
SPI_getargtypeid -- return the data type OID for an argument of
  a plan prepared by 
SPI_prepareSynopsis
Oid SPI_getargtypeid(SPIPlanPtr plan, int argIndex)
Description
   SPI_getargtypeid returns the OID representing the type
   for the argIndex'th argument of a plan prepared by
   SPI_prepare. First argument is at index zero.
  
Arguments
- SPIPlanPtr plan
-       execution plan (returned by - SPI_prepare)
 
- int argIndex
-       zero based index of the argument
      
Return Value
    The type OID of the argument at the given index.
    If the plan is NULL or invalid,
    or argIndex is less than 0 or
    not less than the number of arguments declared for the
    plan,
    SPI_result is set to SPI_ERROR_ARGUMENT
    and InvalidOid is returned.