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| author | Alexander Korotkov <akorotkov@postgresql.org> | 2018-10-15 00:40:17 +0300 |
|---|---|---|
| committer | Alexander Korotkov <akorotkov@postgresql.org> | 2018-10-15 01:06:31 +0300 |
| commit | 872b6f72d419a7fb2bc18236ee70175e8ff2abf0 (patch) | |
| tree | 3a148d233c8361d7fa4162e7f2954e8e06f2b4b8 | |
| parent | 8384ff42486e4326a5e50dc97c16d6aa0e22cd38 (diff) | |
| download | postgresql-872b6f72d419a7fb2bc18236ee70175e8ff2abf0.tar.gz postgresql-872b6f72d419a7fb2bc18236ee70175e8ff2abf0.zip | |
contrib/bloom documentation improvement
This commit documents rounding of "length" parameter and absence of support
for unique indexes and NULLs searching. Backpatch to 9.6 where contrib/bloom
was introduced.
Discussion: https://postgr.es/m/CAF4Au4wPQQ7EHVSnzcLjsbY3oLSzVk6UemZLD1Sbmwysy3R61g%40mail.gmail.com
Author: Oleg Bartunov with minor editorialization by me
Backpatch-through: 9.6
| -rw-r--r-- | doc/src/sgml/bloom.sgml | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/doc/src/sgml/bloom.sgml b/doc/src/sgml/bloom.sgml index 396348c5237..2eb7a4fd40d 100644 --- a/doc/src/sgml/bloom.sgml +++ b/doc/src/sgml/bloom.sgml @@ -51,8 +51,8 @@ <term><literal>length</></term> <listitem> <para> - Length of each signature (index entry) in bits. The default - is <literal>80</> bits and maximum is <literal>4096</>. + Length of each signature (index entry) in bits, it is rounded up to the nearest + multiple of <literal>16</>. The default is <literal>80</> bits and maximum is <literal>4096</literal>. </para> </listitem> </varlistentry> @@ -242,6 +242,20 @@ DEFAULT FOR TYPE text USING bloom AS operations in the future. </para> </listitem> + + <listitem> + <para> + <literal>bloom</literal> access method doesn't support + <literal>UNIQUE</literal> indexes. + </para> + </listitem> + + <listitem> + <para> + <literal>bloom</literal> access method doesn't support searching for + <literal>NULL</literal> values. + </para> + </listitem> </itemizedlist> </para> </sect2> |