From c5f8a2eb1a81a18b52825cc649112f71fe419b12 Mon Sep 17 00:00:00 2001
From: Forest Gregg <fgregg@users.noreply.github.com>
Date: Sat, 27 Aug 2022 10:45:03 -0400
Subject: [PATCH] in extract code, check equality witH IS instead of = for
 nulls (#455)

sqlite "IS" is equivalent to SQL "IS NOT DISTINCT FROM"

close #423
---
 sqlite_utils/db.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sqlite_utils/db.py b/sqlite_utils/db.py
index 18a442a..25c0a70 100644
--- a/sqlite_utils/db.py
+++ b/sqlite_utils/db.py
@@ -1791,7 +1791,7 @@ class Table(Queryable):
                 magic_lookup_column=magic_lookup_column,
                 lookup_table=table,
                 where=" AND ".join(
-                    "[{table}].[{column}] = [{lookup_table}].[{lookup_column}]".format(
+                    "[{table}].[{column}] IS [{lookup_table}].[{lookup_column}]".format(
                         table=self.name,
                         lookup_table=table,
                         column=column,