This file is indexed.

/usr/share/mediawiki-extensions/openid/openid_table.sql is in mediawiki-extensions-openid 3.5~deb7u2.

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CREATE TABLE /*$wgDBprefix*/user_openid (
  uoi_openid varchar(255) NOT NULL,
  uoi_user int(5) unsigned NOT NULL,
  
  PRIMARY KEY uoi_openid (uoi_openid),
  UNIQUE INDEX uoi_user (uoi_user)
) TYPE=InnoDB;