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diff --git a/includes/libs/rdbms/database/DatabaseMysqlBase.php b/includes/libs/rdbms/database/DatabaseMysqlBase.php
index 8fb8db5c16..d1d0179d71 100644
--- a/includes/libs/rdbms/database/DatabaseMysqlBase.php
+++ b/includes/libs/rdbms/database/DatabaseMysqlBase.php
@@ -1418,40 +1418,6 @@ abstract class DatabaseMysqlBase extends Database {
 		return in_array( $name, $this->listViews( $prefix ) );
 	}
 
-	/**
-	 * Allows for index remapping in queries where this is not consistent across DBMS
-	 *
-	 * @param string $index
-	 * @return string
-	 */
-	protected function indexName( $index ) {
-		/**
-		 * When SQLite indexes were introduced in r45764, it was noted that
-		 * SQLite requires index names to be unique within the whole database,
-		 * not just within a schema. As discussed in CR r45819, to avoid the
-		 * need for a schema change on existing installations, the indexes
-		 * were implicitly mapped from the new names to the old names.
-		 *
-		 * This mapping can be removed if DB patches are introduced to alter
-		 * the relevant tables in existing installations. Note that because
-		 * this index mapping applies to table creation, even new installations
-		 * of MySQL have the old names (except for installations created during
-		 * a period where this mapping was inappropriately removed, see
-		 * T154872).
-		 */
-		$renamed = [
-			'ar_usertext_timestamp' => 'usertext_timestamp',
-			'un_user_id' => 'user_id',
-			'un_user_ip' => 'user_ip',
-		];
-
-		if ( isset( $renamed[$index] ) ) {
-			return $renamed[$index];
-		} else {
-			return $index;
-		}
-	}
-
 	protected function isTransactableQuery( $sql ) {
 		return parent::isTransactableQuery( $sql ) &&
 			!preg_match( '/^SELECT\s+(GET|RELEASE|IS_FREE)_LOCK\(/', $sql );