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Doc: fix minor issues in GiST support function documentation.

Browse Source 
gist.sgml and xindex.sgml hadn't been fully updated for the
addition of a sortsupport support function (commit 16fa9b2b3).
xindex.sgml also missed that the compress and decompress support
functions are optional, an apparently far older oversight.

In passing, fix gratuitous inconsistencies in wording and
capitalization.

Noted by E. Rogov.  Back-patch to v14; the residual issues
before that aren't significant enough to bother with.

Discussion: https://postgr.es/m/163335322905.12519.5711557029494638051@wrigleys.postgresql.org
This commit is contained in:
Tom Lane
2021-10-04 13:34:31 -04:00
parent 7111e332c5
commit 36d1a848a8
2 changed files with 22 additions and 20 deletions
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8
doc/src/sgml/gist.sgml
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@ -272,7 +272,7 @@ CREATE INDEX ON my_table USING GIST (my_inet_column inet_ops);
<para>
There are five methods that an index operator class for
<acronym>GiST</acronym> must provide, and five that are optional.
<acronym>GiST</acronym> must provide, and six that are optional.
Correctness of the index is ensured
by proper implementation of the <function>same</function>, <function>consistent</function>
and <function>union</function> methods, while efficiency (size and speed) of the
@ -291,9 +291,9 @@ CREATE INDEX ON my_table USING GIST (my_inet_column inet_ops);
searches). The optional ninth method <function>fetch</function> is needed if the
operator class wishes to support index-only scans, except when the
<function>compress</function> method is omitted. The optional tenth method
<function>options</function> is needed if the operator class provides
the user-specified parameters.
The <function>sortsupport</function> method is also optional and is used to
<function>options</function> is needed if the operator class has
user-specified parameters.
The optional eleventh method <function>sortsupport</function> is used to
speed up building a <acronym>GiST</acronym> index.
</para>