SPI_fname — determine the column name for the specified column number
char * SPI_fname(TupleDesc
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.)
input row description
column number (count starts at 1)
The column name;
colnumber is out of range.
SPI_result set to
SPI_ERROR_NOATTRIBUTE on error.
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