Add support for yii\db\Expression to QueryBuiler simple conditions

fixes #5601

extensions/sphinx/CHANGELOG.md

@@ -4,7 +4,7 @@ Yii Framework 2 sphinx extension Change Log
 2.0.1 under development
 -----------------------
 
-- no changes in this release.
+- Bug #5601: Simple conditions in Query::where() and ActiveQuery::where() did not allow `yii\db\Expression` to be used as the value (cebe, stevekr)
 
 
 2.0.0 October 12, 2014
@@ -41,6 +41,7 @@ Yii Framework 2 sphinx extension Change Log
              All relational queries are now directly served by `ActiveQuery` allowing to use
              custom scopes in relations (cebe)
 
+
 2.0.0-alpha, December 1, 2013
 -----------------------------
 

extensions/sphinx/QueryBuilder.php

@@ -1085,6 +1085,11 @@ class QueryBuilder extends Object
 
         if ($value === null) {
             return "$column $operator NULL";
+        } elseif ($value instanceof Expression) {
+            foreach ($value->params as $n => $v) {
+                $params[$n] = $v;
+            }
+            return "$column $operator {$value->expression}";
         } else {
             $phName = self::PARAM_PREFIX . count($params);
             $params[$phName] = $value;