From 315824978de64164442ce8c5c6b5cb161041a72b Mon Sep 17 00:00:00 2001
From: Maksim Kita <maksim-kita@yandex-team.ru>
Date: Sat, 27 Feb 2021 19:19:21 +0300
Subject: [PATCH] CheckConstraintsBlockOutputStream optimize nullable column
 case

---
 src/DataStreams/CheckConstraintsBlockOutputStream.cpp | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/DataStreams/CheckConstraintsBlockOutputStream.cpp b/src/DataStreams/CheckConstraintsBlockOutputStream.cpp
index 90d6560b9a8..3b0b4db72f9 100644
--- a/src/DataStreams/CheckConstraintsBlockOutputStream.cpp
+++ b/src/DataStreams/CheckConstraintsBlockOutputStream.cpp
@@ -65,10 +65,8 @@ void CheckConstraintsBlockOutputStream::write(const Block & block)
 
                 /// Check if constraint value is nullable
                 const auto & null_map = column_nullable->getNullMapColumn();
-                const auto & data = null_map.getData();
-                const auto * it = std::find(data.begin(), data.end(), true);
-
-                bool null_map_contains_null = it != data.end();
+                const PaddedPODArray<UInt8> & data = null_map.getData();
+                bool null_map_contains_null = !memoryIsZero(data.raw_data(), data.size() * sizeof(UInt8));
 
                 if (null_map_contains_null)
                     throw Exception(