- Fixed GroupBy

src/QueryBuilder.php

@@ -216,11 +216,6 @@ class QueryBuilder
         return $this->where($field, $value, $operator, true);
     }
 
-    public function groupBy() : self
-    {
-        return $this;
-    }
-
     public function limit(int $value) : self
     {
         if ( null === $limit = $this->getFragment(Query\Limit::class) ) {
@@ -257,6 +252,18 @@ class QueryBuilder
         return $this;
     }
 
+    public function groupBy(string $field, ? string $direction = null) : self
+    {
+        if ( null === $groupBy = $this->getFragment(Query\GroupBy::class) ) {
+            $groupBy = new Query\GroupBy();
+            $this->push($groupBy);
+        }
+
+        $groupBy->add($field, $direction);
+        
+        return $this;
+    }
+
     public function join(string $type, /*string | QueryBuilder*/ $table, $field, $value, bool $outer = false, ? string $alias = null) : self
     {
         $join = new Query\Join($this);