SPI_fnumber - determine the column number for the specified column name

TupleDesc rowdesc input row description const char * colname column name

SPI_fnumber returns the column number for the column with the specified name. If colname refers to a system column (e.g., ctid) then the appropriate negative column number will be returned. The caller should be careful to test the return value for exact equality to SPI_ERROR_NOATTRIBUTE to detect an error; testing the result for less than or equal to 0 is not correct unless system columns should be rejected.

SPI_fnumber - determine the column number for the specified column name

Column number (count starts at 1 for user-defined columns), or SPI_ERROR_NOATTRIBUTE if the named column was not found. PostgreSQL 17.5 2025 SPI_FNUMBER(3)

int SPI_fnumber(TupleDesc rowdesc, const char * colname)