Add missing file

src/Core/UUID.cpp

@@ -0,0 +1,19 @@
+#include <Core/UUID.h>
+#include <Common/thread_local_rng.h>
+
+
+namespace DB
+{
+
+namespace UUIDHelpers
+{
+    UUID generateV4()
+    {
+        UInt128 res{thread_local_rng(), thread_local_rng()};
+        res.items[0] = (res.items[0] & 0xffffffffffff0fffull) | 0x0000000000004000ull;
+        res.items[1] = (res.items[1] & 0x3fffffffffffffffull) | 0x8000000000000000ull;
+        return UUID{res};
+    }
+}
+
+}