From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Sat, 16 Apr 2022 15:40:13 +0000 (-0400)
Subject: adapt_from_selectables is a set
X-Git-Tag: rel_2_0_0b1~344
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c538f810bce57472c8960a0a6c4c61024b00f3ed;p=thirdparty%2Fsqlalchemy%2Fsqlalchemy.git

adapt_from_selectables is a set

aliasedclass setting this as a list, making all the containment
checks more expensive.

the presence of the collection also serves as a flag so it
has to stay optional.

Change-Id: Iafffbeb29d77441ca35ecd8048244ee6eed1232c
---

diff --git a/lib/sqlalchemy/orm/util.py b/lib/sqlalchemy/orm/util.py
index 233085f305..4699781a42 100644
--- a/lib/sqlalchemy/orm/util.py
+++ b/lib/sqlalchemy/orm/util.py
@@ -744,11 +744,11 @@ class AliasedInsp(
             # make sure the adapter doesn't try to grab other tables that
             # are not even the thing we are mapping, such as embedded
             # selectables in subqueries or CTEs.  See issue #6060
-            adapt_from_selectables=[
+            adapt_from_selectables={
                 m.selectable
                 for m in self.with_polymorphic_mappers
                 if not adapt_on_names
-            ],
+            },
         )
 
         if nest_adapters: