From d3099e0c89b852424ffb8b03742c941663c1c308 Mon Sep 17 00:00:00 2001
From: Nikolai Kochetov <nik-kochetov@yandex-team.ru>
Date: Fri, 16 Jul 2021 13:56:13 +0300
Subject: [PATCH] Fix build and add comment.

---
 src/Interpreters/ClusterProxy/IStreamFactory.h | 4 ++--
 src/Processors/QueryPlan/ReadFromRemote.h      | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/Interpreters/ClusterProxy/IStreamFactory.h b/src/Interpreters/ClusterProxy/IStreamFactory.h
index d3ad2688c15..d85e97e5a2e 100644
--- a/src/Interpreters/ClusterProxy/IStreamFactory.h
+++ b/src/Interpreters/ClusterProxy/IStreamFactory.h
@@ -36,12 +36,12 @@ public:
         ASTPtr query;
         Block header;
 
-        size_t shard_num;
+        size_t shard_num = 0;
         ConnectionPoolWithFailoverPtr pool;
 
         /// If we connect to replicas lazily.
         /// (When there is a local replica with big delay).
-        bool lazy;
+        bool lazy = false;
         UInt32 local_delay = 0;
     };
 
diff --git a/src/Processors/QueryPlan/ReadFromRemote.h b/src/Processors/QueryPlan/ReadFromRemote.h
index 2045bcc84f7..61099299c36 100644
--- a/src/Processors/QueryPlan/ReadFromRemote.h
+++ b/src/Processors/QueryPlan/ReadFromRemote.h
@@ -14,6 +14,8 @@ using ConnectionPoolWithFailoverPtr = std::shared_ptr<ConnectionPoolWithFailover
 class Throttler;
 using ThrottlerPtr = std::shared_ptr<Throttler>;
 
+/// Reading step from remote servers.
+/// Unite query results from several shards.
 class ReadFromRemote final : public ISourceStep
 {
 public: