Re: [HACKERS] reverse file descriptor to a file name...

> You can't get a file name from a descriptor, because there can be more
> than one.  The system just returns information about the inode, not
> about the directory entries pointing to the inode.
>
> For your purpose, you want:
>
>     Relation->rd_rel->relname
>
> Works like champ.
>
> This is not a trivial question, because the structures in PostgreSQL are
> very complicated until you get used to them.

Speaking of this, I always considered this comment in
optimizer/plan/planner.c to be a classic:

        /* reach right in there, why don't you? */
        if (tletype != reln->rd_att->attrs[i - 1]->atttypid)
            elog(ERROR, "function declared to return type %s does not retrieve (%s.all)", typeTypeName(typ),
typeTypeName(typ));


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