Name
SPI_gettypeid -- Returns the type 
OID of the specified attribute
Synopsis
SPI_gettypeid(tupdesc, fnumber)
Inputs
- TupleDesc tupdesc
 Input tuple description
- int fnumber
 Attribute number
Outputs
- OID
 The type OID for the specified attribute number
- SPI_result
 
Description
SPI_gettypeid 
   returns the type OID for the specified attribute.
Usage
Attribute numbers are 1 based.