Update Join.php

Author: rez1dent3

src/QueryBuilder/Operator/Classes/Join.php

@@ -92,7 +92,11 @@ public function inner()
      */
     public function on($first, $second)
     {
-        return $this->raw($first . ' = ' . $second);
+        return $this->raw(
+            $this->builder->adapter()->quote($first) 
+            . ' = ' .
+            $this->builder->adapter()->quote($second)
+        );
     }
 
     /**
@@ -143,4 +147,4 @@ public function getTable()
         return $this->table;
     }
 
-}
+}