Installing RevisionCommentSupplement with install.php --with-extensions yields:
...index ar_revid_uniq already set on archive table. Creating rev_comment_supp_history table ...[70925ca6a57b4a03fa2dad5b] [no req] Wikimedia\Rdbms\DBQueryError from line 1443 of includes/libs/rdbms/database/Database.php: A database query error has occurred. Did you forget to run your application's database schema updater after upgrading? Query: ALTER TABLE `rev_comment_supp` ADD rcs_latest bigint unsigned NOT NULL default 0 Function: Wikimedia\Rdbms\Database::sourceFile( extensions/RevisionCommentSupplement/sql/patch-rev_comment_supp_history.sql ) Error: 1060 Duplicate column name 'rcs_latest' (localhost:/tmp/quibble-mysql-rz3jeo_k/socket) Backtrace: #0 includes/libs/rdbms/database/Database.php(1413): Wikimedia\Rdbms\Database->makeQueryException(string, integer, string, string) #1 includes/libs/rdbms/database/Database.php(1186): Wikimedia\Rdbms\Database->reportQueryError(string, integer, string, string, boolean) #2 includes/libs/rdbms/database/Database.php(4260): Wikimedia\Rdbms\Database->query(string, string) #3 includes/libs/rdbms/database/Database.php(4195): Wikimedia\Rdbms\Database->sourceStream(unknown type, NULL, NULL, string, NULL) #4 includes/installer/DatabaseUpdater.php(683): Wikimedia\Rdbms\Database->sourceFile(string) #5 includes/installer/DatabaseUpdater.php(726): DatabaseUpdater->applyPatch(string, boolean, string) #6 includes/installer/DatabaseUpdater.php(482): DatabaseUpdater->addTable(string, string, boolean) #7 includes/installer/DatabaseUpdater.php(450): DatabaseUpdater->runUpdates(array, boolean) #8 maintenance/update.php(200): DatabaseUpdater->doUpdates(array) #9 maintenance/doMaintenance.php(94): UpdateMediaWiki->execute() #10 maintenance/update.php(245): require_once(string) #11 {main}
Dummy change for testing https://gerrit.wikimedia.org/r/#/c/152585/