Provided by: postgresql-doc-12_12.2-4_all bug

NAME

       SPI_fname - determine the column name for the specified column number

SYNOPSIS

       char * SPI_fname(TupleDesc rowdesc, int colnumber)

DESCRIPTION

       SPI_fname returns a copy of the column name of the specified column. (You can use pfree to
       release the copy of the name when you don't need it anymore.)

ARGUMENTS

       TupleDesc rowdesc
           input row description

       int colnumber
           column number (count starts at 1)

RETURN VALUE

       The column name; NULL if colnumber is out of range.  SPI_result set to
       SPI_ERROR_NOATTRIBUTE on error.