Re: Question about GetAttributeByNum(Name) ExecQual.c

Zdenek Kotala <Zdenek.Kotala@Sun.COM> writes:
> GetAttributeByNum has first parameter as HeapTupleHeader,  but most functions 
> use Datum and after that they call DatumGetHeapTupleHeader. The difference is 
> that DatumGetHeapTupleHeader performs detoast on tuple(row type).

> Is it intention do not detoast in these functions or it is a bug?

You would certainly not want a tuple to get separately detoasted for
each attribute you pull from it.  So having detoasting here would be
the wrong thing IMHO.
        regards, tom lane