From fc693cc982cce7b4aaf71933bd18aa751ed3b7a0 Mon Sep 17 00:00:00 2001
From: Igor Nikonov <igor@clickhouse.com>
Date: Tue, 16 Jul 2024 21:05:27 +0000
Subject: [PATCH] Fix 02982_parallel_replicas_unexpected_cluster

---
 src/Interpreters/ClusterProxy/executeQuery.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/Interpreters/ClusterProxy/executeQuery.cpp b/src/Interpreters/ClusterProxy/executeQuery.cpp
index 7207efd9ef6..c0d156a8894 100644
--- a/src/Interpreters/ClusterProxy/executeQuery.cpp
+++ b/src/Interpreters/ClusterProxy/executeQuery.cpp
@@ -736,6 +736,12 @@ bool canUseParallelReplicasOnInitiator(const ContextPtr & context)
         return cluster->getShardsInfo().at(shard_num - 1).getAllNodeCount() > 1;
     }
 
+    if (cluster->getShardCount() > 1)
+        throw DB::Exception(
+            ErrorCodes::UNEXPECTED_CLUSTER,
+            "`cluster_for_parallel_replicas` setting refers to cluster with {} shards. Expected a cluster with one shard",
+            cluster->getShardCount());
+
     return false;
 }