Draft: Closes #3514117

• /core/modules/mysql/tests/src/Unit/IdentifierTest.php
• /core/modules/mysql/src/Driver/Database/mysql/IdentifierHandler.php

Closes #3514117

core/lib/Drupal/Core/Cache/DatabaseBackend.php

@@ -128,7 +128,7 @@ public function getMultiple(&$cids, $allow_invalid = FALSE) {
     // ::select() is a much smaller proportion of the request.
     $result = [];
     try {
-      $result = $this->connection->query('SELECT [cid], [data], [created], [expire], [serialized], [tags], [checksum] FROM {' . $this->connection->escapeTable($this->bin) . '} WHERE [cid] IN ( :cids[] ) ORDER BY [cid]', [':cids[]' => array_keys($cid_mapping)]);
+      $result = $this->connection->query('SELECT [cid], [data], [created], [expire], [serialized], [tags], [checksum] FROM {' . $this->bin . '} WHERE [cid] IN ( :cids[] ) ORDER BY [cid]', [':cids[]' => array_keys($cid_mapping)]);
     }
     catch (\Exception) {
       // Nothing to do.