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Remove INCLUDE attributes section from docs.

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Discussing covering indexes in a chapter that is mostly about the
behavior of B-Tree operator classes is unnecessary.  The CREATE INDEX
documentation's handling of covering indexes seems sufficient.

Discussion: https://postgr.es/m/CAH2-WzmpU=L_6VjhhOAMfoyHLr-pZd1kDc+jpa3c3a8EOmtcXA@mail.gmail.com
This commit is contained in:
Peter Geoghegan
2018-06-16 15:28:50 -07:00
parent e716585235
commit 514d4a1338
1 changed files with 0 additions and 17 deletions
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17
doc/src/sgml/btree.sgml
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@@ -433,23 +433,6 @@ returns bool
</sect1>
<sect1 id="btree-included-attributes">
<title>Included attributes in B-tree indexes</title>
<para>
As of <productname>PostgreSQL</productname> 11.0 there is an optional
INCLUDE clause, which allows to add non-key (included) attributes to index.
Those included attributes allow more queries to benefit from index-only scans.
We never use included attributes in ScanKeys for search. That allows us to
include into B-tree any datatypes, even those which don't have suitable
operator classes. Included columns only stored in regular tuples on leaf
pages. All pivot tuples on non-leaf pages and highkey tuples are truncated
to contain only key attributes. That helps to slightly reduce the size of
index.
</para>
</sect1>
<sect1 id="btree-implementation">
<title>Implementation</title>