Excerpts from Tom Lane's message of sáb jul 31 09:57:13 -0400 2010:
> So far as I can see, it's impossible to handle this situation when
> examining only one TID per stream with no lookahead. Choosing to
> advance the second stream would obviously fail in many other cases,
> so there is no correct action. The only reasonable way out is to
> forbid the case --- that is, decree that a keystream may *not*
> contain both lossy and nonlossy pointers to the same page.
Would it make sense to order the streams differently? I mean, what if
whole-page pointers in the lossy stream are processed before regular ones?
(I am thoroughly unfamiliar with this stuff, so forgive me if I've
gotten the concepts and terminology all wrong)
--
Álvaro Herrera <alvherre@commandprompt.com>
The PostgreSQL Company - Command Prompt, Inc.
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