diff options
| author | Alexander Korotkov | 2018-10-14 21:40:17 +0000 |
|---|---|---|
| committer | Alexander Korotkov | 2018-10-14 22:01:57 +0000 |
| commit | 98afb839059b2708ee4b541d0186581493a2713b (patch) | |
| tree | 09d8014af6f691ea31c4510eb8fff6ff475b2af2 | |
| parent | b403ea43e40aae3ebb03cf3844cf84b43ab34b8a (diff) | |
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 f857b09bd6..1f671ed919 100644 --- a/doc/src/sgml/bloom.sgml +++ b/doc/src/sgml/bloom.sgml @@ -51,8 +51,8 @@ <term><literal>length</literal></term> <listitem> <para> - Length of each signature (index entry) in bits. The default - is <literal>80</literal> bits and maximum is <literal>4096</literal>. + Length of each signature (index entry) in bits, it is rounded up to the nearest + multiple of 16. The default is <literal>80</literal> 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> |