From 99f1aa65b310ee0c46e73e55adee5963f09df031 Mon Sep 17 00:00:00 2001
From: Anastasiya Rodigina <anrodigina@gmail.com>
Date: Sun, 26 May 2019 20:41:51 +0000
Subject: [PATCH] Try 1 to fix tests

---
 dbms/src/DataStreams/FinishSortingBlockInputStream.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/dbms/src/DataStreams/FinishSortingBlockInputStream.cpp b/dbms/src/DataStreams/FinishSortingBlockInputStream.cpp
index c0a45fc544e..46458f0a407 100644
--- a/dbms/src/DataStreams/FinishSortingBlockInputStream.cpp
+++ b/dbms/src/DataStreams/FinishSortingBlockInputStream.cpp
@@ -148,8 +148,11 @@ Block FinishSortingBlockInputStream::readImpl()
             blocks.push_back(block);
         }
 
-        impl = std::make_unique<MergeSortingBlocksBlockInputStream>(blocks, description_to_sort, max_merged_block_size, limit);
-        res = impl->read();
+        if (!blocks.empty())
+	{
+	    impl = std::make_unique<MergeSortingBlocksBlockInputStream>(blocks, description_to_sort, max_merged_block_size, limit);
+            res = impl->read();
+	}
     }
 
     if (res)