Re: Newbie Developer Question

Thanks so much for the help. _hash_first, and _hash_next all take the scan
object as a parameter. How do you create or get a scan object?
hashbeginscan looks like it sets up a scan and returns it, but it takes the
number of keys and the array of scan keys. Where do we get these arguments
from?

-Matt

On 2/1/07, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>
> "Matthew Campbell" <mtthw(dot)cmpbll(at)gmail(dot)com> writes:
> > ... We've been digging through the src/backend/access/hash/
> > and we're having a hard time figuring out the correct way to walk
> through
> > items in a page. Is this what the hashbeginscan() method is for?
>
> No, hashbeginscan doesn't do much at all except initialize state. The
> interesting stuff happens during successive hashgettuple calls ---
> specifically _hash_first the first time and _hash_next on later calls.
>
> regards, tom lane
>