From ff13752d01019ec1327f810ff4ad7f24a7abd710 Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@yandex-team.ru>
Date: Sun, 2 Sep 2018 06:47:14 +0300
Subject: [PATCH] Addition to prev. revision [#CLICKHOUSE-2]

---
 dbms/src/Interpreters/Set.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dbms/src/Interpreters/Set.cpp b/dbms/src/Interpreters/Set.cpp
index 9bc5d697b42..be70380f3e1 100644
--- a/dbms/src/Interpreters/Set.cpp
+++ b/dbms/src/Interpreters/Set.cpp
@@ -317,6 +317,9 @@ ColumnPtr Set::execute(const Block & block, bool negative) const
     ColumnUInt8::Container & vec_res = res->getData();
     vec_res.resize(block.safeGetByPosition(0).column->size());
 
+    if (vec_res.empty())
+        return res;
+
     std::shared_lock lock(rwlock);
 
     /// If the set is empty.