From 224330a8a6b6e9707f4fefde803082b7ad75bc5d Mon Sep 17 00:00:00 2001
From: Pavel Ivanov <pudge1000-7@qavm-9f0570a4.qemu>
Date: Mon, 25 Nov 2024 16:42:46 +0300
Subject: [PATCH] [CBO] user warning added if cbo didn't work

---
 ydb/library/yql/dq/opt/dq_opt_join_cost_based.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ydb/library/yql/dq/opt/dq_opt_join_cost_based.cpp b/ydb/library/yql/dq/opt/dq_opt_join_cost_based.cpp
index 5018e4a70644..b9ee3c002e5a 100644
--- a/ydb/library/yql/dq/opt/dq_opt_join_cost_based.cpp
+++ b/ydb/library/yql/dq/opt/dq_opt_join_cost_based.cpp
@@ -357,6 +357,7 @@ TExprBase DqOptimizeEquiJoinWithCosts(
     // of the EquiJoin and n-1 argument are the parameters to EquiJoin
 
     if (!DqCollectJoinRelationsWithStats(rels, typesCtx, equiJoin, providerCollect)){
+        ctx.AddWarning(YqlIssue({}, TIssuesIds::WARNING, "Cost Based Optimizer didn't work: couldn't load statistics"));
         return node;
     }