/usr/share/mediawiki-extensions/openid/patches/patch-add_multiple_key_index_user_openid_user.sql is in mediawiki-extensions-openid 3.6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- SQL schema update for OpenID extension to add a non unique uoi_user index
--
CREATE INDEX /*i*/user_openid_user ON /*_*/user_openid(uoi_user);
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