Arch package is configured with ICU support, but I think you need to use ICU collations explicitly: https://postgresql.verite.pro/blog/2018/07/25/icu-extension.

Arch package is configured with ICU support, but I think you need to use ICU collations explicitly: https://postgresql.verite.pro/blog/2018/07/25/icu-extension.html https://postgresql.verite.pro/blog/2018/07/25/icu-extension.... SELECT * FROM pg_catalog.pg_collation; As usual with collations, you must be careful and know what you are doing (old collations are also still available, for backwards compatibility)