Fix #18499: When using yii\db\Query::all() and yii\db\Query::$indexBy, the yii\db\Query::$indexBy is auto inserted into yii\db\Query::$select - the same as in yii\db\Query::column()

Co-authored-by: Bizley <pawel@positive.codes>
Co-authored-by: Alexander Makarov <sam@rmcreative.ru>

framework/db/ActiveQueryInterface.php

@@ -53,6 +53,8 @@ interface ActiveQueryInterface extends QueryInterface
      *     // return the index value corresponding to $model
      * }
      * ```
+     * The column has to be a part of the `SELECT` fragment of a SQL statement.
+     * If [[yii\db\Query::select()|select()]] is used with an array in its parameter, Yii handles adding that required SQL fragment for you.
      *
      * @return $this the query object itself
      */