Re: [HACKERS] Merge join for GiST

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От Andrew Borodin
Тема Re: [HACKERS] Merge join for GiST
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Msg-id CAJEAwVH+YBgfkAtn1qZJhjvbtRPbgzcU3rUt=nJg35hTrsvrYg@mail.gmail.com
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Ответ на Re: [HACKERS] Merge join for GiST  (Jeff Davis <pgsql@j-davis.com>)
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2017-04-13 11:30 GMT+05:00 Jeff Davis <pgsql@j-davis.com>:
> I don't quite follow. I don't think any of these proposals uses btree,
> right? Range merge join doesn't need any index, your proposal uses
> gist, and PgSphere's crossmatch uses gist.

Merge join will use presorted data, B-tree provides sorted data.
Merge Join cannot join non-sorted data, can it?

Indeed, B-tree is not the only sorted data provider. In this sight,
Range Merge join is even more generic.

Best regards, Andrey Borodin.

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