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doc: Document pg_trgm being case-insensitive by default 

pg_trgm is by default operating case-insensitively but the docs didn't
mention that at all.

Author: Erik Rijkers <er@xs4all.nl>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Reported-by: marcmaiwald@googlemail.com
Discussion: https://postgr.es/m/166064504415.652.12724576876807446945@wrigleys.postgresql.org
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Daniel Gustafsson 2022-08-17 09:56:02 +02:00
parent d265cd2029
commit 3e7d94fca0
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doc/src/sgml/pgtrgm.sgml
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@ -416,6 +416,8 @@
the above-described similarity operators, and additionally support
trigram-based index searches for <literal>LIKE</literal>, <literal>ILIKE</literal>,
<literal>~</literal>, <literal>~*</literal> and <literal>=</literal> queries.
The similarity comparisons are case-insensitive in a default build of
<filename>pg_trgm</filename>.
Inequality operators are not supported.
Note that those indexes may not be as efficient as regular B-tree indexes
for equality operator.