Fix from e719ff5 moved to yii\sphinx\Query

extensions/sphinx/CHANGELOG.md

@@ -4,7 +4,7 @@ Yii Framework 2 sphinx extension Change Log
 2.0.2 under development
 -----------------------
 
-- no changes in this release.
+- Bug #6621: Creating sub query at `yii\sphinx\Query::queryScalar()` fixed (klimov-paul)
 
 
 2.0.1 December 07, 2014

extensions/sphinx/Query.php

@@ -366,6 +366,34 @@ class Query extends \yii\db\Query
             ->queryColumn();
     }
 
+    /**
+     * @inheritdoc
+     */
+    protected function queryScalar($selectExpression, $db)
+    {
+        $select = $this->select;
+        $limit = $this->limit;
+        $offset = $this->offset;
+
+        $this->select = [$selectExpression];
+        $this->limit = null;
+        $this->offset = null;
+        $command = $this->createCommand($db);
+
+        $this->select = $select;
+        $this->limit = $limit;
+        $this->offset = $offset;
+
+        if (empty($this->groupBy) && empty($this->union) && !$this->distinct) {
+            return $command->queryScalar();
+        } else {
+            return (new Query)->select([$selectExpression])
+                ->from(['c' => $this])
+                ->createCommand($command->db)
+                ->queryScalar();
+        }
+    }
+
     /**
      * Creates a new Query object and copies its property values from an existing one.
      * The properties being copies are the ones to be used by query builders.