> On Sat, Jan 5, 2019 at 1:35 AM Tatsuo Ishii <ishii@sraoss.co.jp> wrote:
>> <productname>PostgreSQL</productname> includes an implementation of the
>> standard <acronym>btree</acronym> (multi-way binary tree) index data
>> structure.
>>
>> I think the term "btree" here means "multi-way balanced tree", rather
>> than "multi-way binary tree". In fact in our btree, there could be
>> more than one key in a node. Patch attached.
>
> +1 for applying this patch. The existing wording is highly confusing,
> especially because many people already incorrectly think that a B-Tree
> is just like a self-balancing binary search tree.
>
> There is no consensus on exactly what the "b" actually stands for, but
> it's definitely not "binary". I suppose that the original author meant
> that a B-Tree is a generalization of a binary tree, which is basically
> true -- though that's a very academic point.
Any objection for this? If not, I will commit the patch to master and
REL_11_STABLE branches (btree.sgml first appeared in PostgreSQL 11).
Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
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