Re: Patch for circular buffer in tuplestore to optimize merge joins (v1)

Via IM, author says it is ready.

Your patch has been added to the PostgreSQL unapplied patches list at:

http://momjian.postgresql.org/cgi-bin/pgpatches

It will be applied as soon as one of the PostgreSQL committers reviews
and approves it.

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stark wrote:
>
> This patch implements a circular buffer in tuplestore which drops old tuples
> as they're no longer needed. It uses this for merge joins to avoid having to
> spill the tuplestore if no single value exceeds work_mem. It also is what's
> needed for both recursive query support and OLAP window functions (hence why
> it implements the more complex circular buffer rather than just moving the
> single tuple up to the head of the buffer).
>
> This was mostly already done by Simon, I just finished the logic in tuplesort.c.
>
> This is actually not quite polished so I guess it's still a WIP but it's
> certainly ready to be reviewed. All that remains is polishing. If there's
> anything in there people object to now I would like to know.
>

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>
>
> --
> Gregory Stark
> EnterpriseDB http://www.enterprisedb.com
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