From 80340e7e5c2b65554101ec70ed1b9a493dc6f9b0 Mon Sep 17 00:00:00 2001
From: Anton Ivashkin <ianton@live.com>
Date: Thu, 7 May 2026 15:14:00 +0200
Subject: [PATCH] Do not read empty namespaces from catalog

---
 src/Databases/DataLake/RestCatalog.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/Databases/DataLake/RestCatalog.cpp b/src/Databases/DataLake/RestCatalog.cpp
index 1abbf67bc58f..d7bf5ff9dd3c 100644
--- a/src/Databases/DataLake/RestCatalog.cpp
+++ b/src/Databases/DataLake/RestCatalog.cpp
@@ -646,6 +646,13 @@ void RestCatalog::getNamespacesRecursive(
     {
         chassert(current_namespace.starts_with(base_namespace));
 
+        /// Protection from subnamepsaces with empty names
+        if (current_namespace == base_namespace)
+        {
+            LOG_WARNING(log, "Namespace {} has a subnamespace with empty name. This is an error in catalog implementation.", base_namespace);
+            continue;
+        }
+
         if (stop_condition && stop_condition(current_namespace))
             break;