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_1_4_36~11
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=549e3a5be6a8c6db7183b1f7d20e8f3f39687ef4;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
(cherry picked from commit c538f810bce57472c8960a0a6c4c61024b00f3ed)
---

diff --git a/lib/sqlalchemy/orm/util.py b/lib/sqlalchemy/orm/util.py
index 9ec2ad0768..50ac8917d3 100644
--- a/lib/sqlalchemy/orm/util.py
+++ b/lib/sqlalchemy/orm/util.py
@@ -708,11 +708,11 @@ 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: