diff --git a/src/CacheKey.php b/src/CacheKey.php
index 057582f..eea4e29 100644
--- a/src/CacheKey.php
+++ b/src/CacheKey.php
@@ -263,6 +263,10 @@ protected function getQueryColumns(array $columns) : string
             return "_" . implode("_", $columns);
         }
 
+        $columns = array_map(function ($column) {
+            return $this->expressionToString($column);
+        }, $columns);
+        
         return "_" . implode("_", $columns);
     }