diff --git a/pkg/expr/mongo.go b/pkg/expr/mongo.go
index ed35a6dc3e2d287e70562db574eaadfbb65618d0..a6a147d19479b408bdb91fc0872f2fc85942b6d6 100644
--- a/pkg/expr/mongo.go
+++ b/pkg/expr/mongo.go
@@ -681,18 +681,18 @@ func (c *compiler) handleLenNode(node *ast.BinaryNode) bson.M {
 		return bson.M{c.identifier(lenNode.Arguments[0]): bson.M{"$eq": bson.A{}}}
 	case (op == "!=" || op == ">") && length == 0:
 		return bson.M{c.identifier(lenNode.Arguments[0]): bson.M{"$exists": true, "$type": "array", "$ne": bson.A{}}}
+	case op == ">=" && length == 0:
+		return bson.M{c.identifier(lenNode.Arguments[0]): bson.M{"$exists": true, "$type": "array"}}
+	case op == "<" && length == 0:
+		panic("invalid comparison: len() cannot be less than 0")
 	case op == "==":
 		return bson.M{c.identifier(lenNode.Arguments[0]): bson.M{"$size": length}}
 	case op == "!=":
 		return bson.M{c.identifier(lenNode.Arguments[0]): bson.M{"$not": bson.M{"$size": length}}}
 	case op == ">":
 		return bson.M{c.identifier(lenNode.Arguments[0]) + "." + strconv.Itoa(length): bson.M{"$exists": true}}
-	case op == ">=" && length == 0:
-		return bson.M{c.identifier(lenNode.Arguments[0]): bson.M{"$exists": true, "$type": "array"}}
 	case op == ">=":
 		return bson.M{c.identifier(lenNode.Arguments[0]) + "." + strconv.Itoa(length-1): bson.M{"$exists": true}}
-	case op == "<" && length == 0:
-		panic("invalid comparison: len() cannot be less than 0")
 	case op == "<":
 		return bson.M{c.identifier(lenNode.Arguments[0]) + "." + strconv.Itoa(length-1): bson.M{"$exists": false}}
 	case op == "<=":