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Documentation corrections for opclass parameters

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Discussion: https://postgr.es/m/20200331024419.GB14618%40telsasoft.com
Author: Justin Pryzby
This commit is contained in:
Alexander Korotkov
2020-04-01 14:42:17 +03:00
parent 8d84dd0012
commit 3f1802e1fd
5 changed files with 42 additions and 41 deletions
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27
doc/src/sgml/intarray.sgml
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@@ -265,7 +265,7 @@
</para>
<para>
Two parametrized GiST index operator classes are provided:
Two parameterized GiST index operator classes are provided:
<literal>gist__int_ops</literal> (used by default) is suitable for
small- to medium-size data sets, while
<literal>gist__intbig_ops</literal> uses a larger signature and is more
@@ -276,22 +276,23 @@
</para>
<para>
<literal>gist__int_ops</literal> approximates integer set as an array of
integer ranges. Optional integer parameter <literal>numranges</literal> of
<literal>gist__int_ops</literal> determines maximum number of ranges in
one index key. Default value of <literal>numranges</literal> is 100.
<literal>gist__int_ops</literal> approximates an integer set as an array of
integer ranges. Its optional integer parameter <literal>numranges</literal>
determines the maximum number of ranges in
one index key. The default value of <literal>numranges</literal> is 100.
Valid values are between 1 and 253. Using larger arrays as GiST index
keys leads to more precise search (scan less fraction of index, scan less
heap pages), but larger index.
keys leads to a more precise search (scaning a smaller fraction of the index and
fewer heap pages), at the cost of a larger index.
</para>
<para>
<literal>gist__intbig_ops</literal> approximates integer set as a bitmap
signature. Optional integer parameter <literal>siglen</literal> of
<literal>gist__intbig_ops</literal> determines signature length in bytes.
Default signature length is 16 bytes. Valid values of signature length
are between 1 and 2024 bytes. Longer signatures leads to more precise
search (scan less fraction of index, scan less heap pages), but larger index.
<literal>gist__intbig_ops</literal> approximates an integer set as a bitmap
signature. Its optional integer parameter <literal>siglen</literal>
determines the signature length in bytes.
The default signature length is 16 bytes. Valid values of signature length
are between 1 and 2024 bytes. Longer signatures lead to a more precise
search (scanning a smaller fraction of the index and fewer heap pages), at
the cost of a larger index.
</para>
<para>