diff --git a/pkg/expr/mongo.go b/pkg/expr/mongo.go
index de14bb57a6e7609b6f770d8318abbdc1ca02694b..bd57a30d727984091ddea0deb2135cfb8b64de8b 100644
--- a/pkg/expr/mongo.go
+++ b/pkg/expr/mongo.go
@@ -672,19 +672,19 @@ func (c *compiler) handleLenNode(node *ast.BinaryNode) (result bson.M, ok bool)
 	}
 
 	switch node.Operator {
-	case "==": // +
+	case "==":
 		if length == 0 {
 			return bson.M{c.identifier(lenNode.Arguments[0]): bson.M{"$eq": bson.A{}}}, true
 		}
 		return bson.M{c.identifier(lenNode.Arguments[0]): bson.M{"$size": length}}, true
 
-	case "!=": // +
+	case "!=":
 		if length == 0 {
 			return bson.M{c.identifier(lenNode.Arguments[0]): bson.M{"$exists": true, "$type": "array", "$ne": bson.A{}}}, true
 		}
 		return bson.M{c.identifier(lenNode.Arguments[0]): bson.M{"$not": bson.M{"$size": length}}}, true
 
-	case ">": // +
+	case ">":
 		if length == 0 {
 			return bson.M{c.identifier(lenNode.Arguments[0]): bson.M{"$exists": true, "$type": "array", "$ne": bson.A{}}}, true
 		}