From 4ec8012e27dbd44b83ed1289b221c610264f7b3b Mon Sep 17 00:00:00 2001
From: Nikolai Kochetov <nik-kochetov@yandex-team.ru>
Date: Thu, 18 Jun 2020 16:43:29 +0300
Subject: [PATCH] Fix msan test.

---
 src/Columns/IColumnImpl.h | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/Columns/IColumnImpl.h b/src/Columns/IColumnImpl.h
index 06261ba4adc..74bc1c96563 100644
--- a/src/Columns/IColumnImpl.h
+++ b/src/Columns/IColumnImpl.h
@@ -79,7 +79,16 @@ void IColumn::compareImpl(const Derived & rhs, size_t rhs_row_num,
         if constexpr (use_indexes)
             row = indexes[i];
 
-        compare_results[row] = compareAt(row, rhs_row_num, rhs, nan_direction_hint);
+        int res = compareAt(row, rhs_row_num, rhs, nan_direction_hint);
+
+        /// We need to convert int to Int8. Sometimes comparison return values which do not fit in one byte.
+        if (res < 0)
+            compare_results[row] = -1;
+        else if (res > 0)
+            compare_results[row] = 1;
+        else
+            compare_results[row] = 0;
+
         if constexpr (reversed)
             compare_results[row] = -compare_results[row];