Fix #18134: Instance of ExpressionInterface will not be quoted in Connection:quoteColumnName

framework/CHANGELOG.md

@@ -24,6 +24,7 @@ Yii Framework 2 Change Log
 - Enh #18120: Include path to the log file into error message if `FileTarget::export` fails (uaoleg)
 - Enh #15202: Add optional param `--silent-exit-on-exception` in `yii\console\Controller` (egorrishe)
 - Bug #18110: Add quotes to return value of viewName in MSSQL schema. It is `[someView]` now (darkdef)
+- Bug #18134: Instance of `ExpressionInterface` will not be quoted in `Connection:quoteColumnName` (darkdef)
 
 
 2.0.35 May 02, 2020

framework/db/Connection.php

@@ -925,11 +925,15 @@ class Connection extends Component
      * If the column name contains prefix, the prefix will also be properly quoted.
      * If the column name is already quoted or contains special characters including '(', '[[' and '{{',
      * then this method will do nothing.
-     * @param string $name column name
+     * If the column name is an instance of `ExpressionInterface` it is returned as is.
+     * @param string $name|ExpressionInterface column name
      * @return string the properly quoted column name
      */
     public function quoteColumnName($name)
     {
+        if ($name instanceof ExpressionInterface) {
+            return $name;
+        }
         if (isset($this->_quotedColumnNames[$name])) {
             return $this->_quotedColumnNames[$name];
         }