| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Pavel Stehule" <pavel(dot)stehule(at)hotmail(dot)com> |
| Cc: | neilc(at)samurai(dot)com, pgsql-patches(at)postgresql(dot)org, jonah(dot)harris(at)gmail(dot)com |
| Subject: | Re: scrollable cursor sup. for SPI |
| Date: | 2007-01-16 04:45:18 |
| Message-ID: | 15119.1168922718@sss.pgh.pa.us |
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| Lists: | pgsql-patches |
"Pavel Stehule" <pavel(dot)stehule(at)hotmail(dot)com> writes:
> if I comprehended it well CURSOR_OPT_SCROLL is set only when SCROLL is cheap
> (not when is possible). It's true?
Nope. If you want a scrollable plan you need to make sure you tell the
planner about it. SPI_cursor_open is not in charge, it's merely looking
at what the planner did.
As for that other stuff, when and if we support it, it would be time to
add a SPI entry point that supports it. I'm disinclined to add an API
on speculation though --- by the time the feature actually exists, we
might not like the API anymore anyway.
regards, tom lane
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