Modified generation of the union queries

Author: AdalbertMemSQL

src/Query/Grammar.php

@@ -176,6 +176,19 @@ protected function compileUnions(Builder $query)
         return ltrim($sql);
     }
 
+    /**
+     * Compile a single union statement.
+     *
+     * @param  array  $union
+     * @return string
+     */
+    protected function compileUnion(array $union)
+    {
+        $conjunction = $union['all'] ? ' union all ' : ' union ';
+
+        return $conjunction.'('.$union['query']->toSql().')';
+    }
+
     /**
      * Compile a select query into SQL.
      *