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doc PG 18 relnotes: Add migration note about tsearch

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Document the small migration hazard introduced in commit fb1a18810f,
as suggested there.

Reviewed-by: Daniel Verite <daniel@manitou-mail.org>
Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Discussion: https://www.postgresql.org/message-id/flat/653f3b84-fc87-45a7-9a0c-bfb4fcab3e7d%40eisentraut.org
This commit is contained in:
Peter Eisentraut
2025-08-29 10:18:10 +02:00
parent 58ea074f14
commit d1073c3b4c
1 changed files with 22 additions and 0 deletions
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doc/src/sgml/release-18.sgml
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@@ -266,6 +266,28 @@ Author: Fujii Masao <fujii@postgresql.org>
</para>
</listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2024-12-17 [fb1a18810f0] Remove ts_locale.c's lowerstr()
-->
<listitem>
<para>
The locale implementation underlying full-text search was improved. It
now observes the locale provider configured for the database for case
conversions. It was previously hardcoded to use libc. In database
clusters that use a locale provider other than libc (that is, ICU or
builtin) and where the locale configured through that locale provider
behaves differently from the LC_CTYPE setting configured for the database,
this could cause changes in behavior of some functions related to
full-text search as well as the pg_trgm extension. When upgrading such
database clusters using pg_upgrade, it is recommended to reindex all
indexes related to full-text search and pg_trgm after the upgrade.
<ulink url="&commit_baseurl;fb1a18810f0">&sect;</ulink>
</para>
</listitem>
</itemizedlist>
</sect2>