From 63510ace09fae8337f38a244247dccf123f87ddf Mon Sep 17 00:00:00 2001
From: Yuriy Kaminskiy <yumkam7@ydb.tech>
Date: Thu, 23 Oct 2025 12:26:28 +0300
Subject: [PATCH] yql_kikimr_datasource RewriteIO: avoid sigsegv on missing
 Metadata (#26795)

(cherry picked from commit 5c5e8ef3221b873f851e4906452a542f922ae238)
---
 ydb/core/kqp/provider/yql_kikimr_datasource.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ydb/core/kqp/provider/yql_kikimr_datasource.cpp b/ydb/core/kqp/provider/yql_kikimr_datasource.cpp
index bfe1679f07c6..ed94cdcb2680 100644
--- a/ydb/core/kqp/provider/yql_kikimr_datasource.cpp
+++ b/ydb/core/kqp/provider/yql_kikimr_datasource.cpp
@@ -710,6 +710,7 @@ class TKikimrDataSource : public TDataProviderBase {
         const TString tablePath = key.GetTablePath();
         auto& tableDesc = SessionCtx->Tables().GetTable(cluster, tablePath);
         if (key.GetKeyType() == TKikimrKey::Type::Table) {
+            YQL_ENSURE(tableDesc.Metadata);
             if (tableDesc.Metadata->Kind == EKikimrTableKind::External) {
                 if (tableDesc.Metadata->ExternalSource.SourceType == ESourceType::ExternalDataSource && tableDesc.Metadata->TableType == NYql::ETableType::Unknown) {
                     ctx.AddError(TIssue(node->Pos(ctx),