From 1054502d5d9e07c9d1cfaa48ab1b7ec8ae1c225e Mon Sep 17 00:00:00 2001
From: olliemath <oliver.margetts@gmail.com>
Date: Sun, 8 Aug 2021 10:04:18 +0100
Subject: [PATCH] Bugfix: fix NO_VALUE copy semantics

Previously copying the NO_VALUE singleton would yield a different
instance. This caused some problems. Now it really is a singleton.
---
 clickhouse_orm/utils.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/clickhouse_orm/utils.py b/clickhouse_orm/utils.py
index ef79c27..d734914 100644
--- a/clickhouse_orm/utils.py
+++ b/clickhouse_orm/utils.py
@@ -154,5 +154,11 @@ class NoValue:
     def __repr__(self):
         return "NO_VALUE"
 
+    def __copy__(self):
+        return self
+
+    def __deepcopy__(self, memo):
+        return self
+
 
 NO_VALUE = NoValue()