Name
SPI_getbinval -- Returns the binary value of the specified attribute
Synopsis
SPI_getbinval(tuple, tupdesc, fnumber, isnull)
Inputs
- HeapTuple tuple
- Input tuple to be examined 
- TupleDesc tupdesc
- Input tuple description 
- int fnumber
- Attribute number 
Outputs
- Datum
- Attribute binary value 
- bool * isnull
- flag for null value in attribute 
- SPI_result
Description
SPI_getbinval 
   returns the binary value of the specified attribute.
Usage
Attribute numbers are 1 based.
Algorithm
Does not allocate new space for the binary value.