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If extensions of equal names were installed in different directories in the path, the views pg_available_extensions and pg_available_extension_versions would show all of them, even though only the first one was actually reachable by CREATE EXTENSION. To fix, have those views skip extensions found later in the path if they have names already found earlier. Also add a bit of documentation that only the first extension in the path can be used. Reported-by: Pierrick <pierrick.chovelon@dalibo.com> Discussion: https://www.postgresql.org/message-id/flat/8f5a0517-1cb8-4085-ae89-77e7454e27ba%40dalibo.com