On 2 Oct 2008, at 05:44 AM, Tom Lane <[EMAIL PROTECTED]> wrote:
"Hitoshi Harada" <[EMAIL PROTECTED]> writes:
Hmm, I've looked over the patch. Logically window functions can
access
arbitrary rows that have been stored in a frame. Thus I had thought
tuplestore should hold all the positions and allow arbitrary random
access indicated by integer. Maybe those functionalities can be
abstracted by the window function API itself. For this matter it
seems
that you'd better to look at my future patch.
Well, the problem with defining it as "arbitrary" random access is
that
there's no way for the tuplestore to throw away old data.
And that there's no way to make it work if the tuplestore has spilled
to disk.
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