From 7f28a8927392c02b157ce98dd43d52877ba17ed3 Mon Sep 17 00:00:00 2001
From: Yakov Olkhovskiy <99031427+yakov-olkhovskiy@users.noreply.github.com>
Date: Wed, 9 Nov 2022 09:39:27 -0500
Subject: [PATCH] fix ub type punning

---
 src/Common/HashTable/Hash.h | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/src/Common/HashTable/Hash.h b/src/Common/HashTable/Hash.h
index f36ab576766..f7c653f50d4 100644
--- a/src/Common/HashTable/Hash.h
+++ b/src/Common/HashTable/Hash.h
@@ -224,14 +224,9 @@ template <typename T>
 requires (sizeof(T) <= sizeof(UInt64))
 inline size_t hashCRC32(T key, DB::UInt64 updated_value = -1)
 {
-    union
-    {
-        T in;
-        DB::UInt64 out;
-    } u;
-    u.out = 0;
-    u.in = key;
-    return intHashCRC32(u.out, updated_value);
+    DB::UInt64 out {0};
+    std::memcpy(&out, &key, sizeof(T));
+    return intHashCRC32(out, updated_value);
 }
 
 template <typename T>