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vendor/yiisoft/yii2/db/ExpressionInterface.php

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+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\db;
+
+/**
+ * Interface ExpressionInterface should be used to mark classes, that should be built
+ * in a special way.
+ *
+ * The database abstraction layer of Yii framework supports objects that implement this
+ * interface and will use [[ExpressionBuilderInterface]] to build them.
+ *
+ * The default implementation is a class [[Expression]].
+ *
+ * @author Dmytro Naumenko <d.naumenko.a@gmail.com>
+ * @since 2.0.14
+ */
+interface ExpressionInterface
+{
+}