From 67f9d076cfc1858b94f9ed6d1a5ce2327dcc8d0d Mon Sep 17 00:00:00 2001
From: Adam Johnson <me@adamj.eu>
Date: Wed, 22 Apr 2020 19:28:01 +0100
Subject: [PATCH] Avoided unnecessary recompilation of ordering clause regex in
 SQLCompiler.

---
 django/db/models/sql/compiler.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/django/db/models/sql/compiler.py b/django/db/models/sql/compiler.py
index 9433540d7c..05597173ee 100644
--- a/django/db/models/sql/compiler.py
+++ b/django/db/models/sql/compiler.py
@@ -16,9 +16,16 @@ from django.db.models.sql.query import Query, get_order_dir
 from django.db.transaction import TransactionManagementError
 from django.utils.functional import cached_property
 from django.utils.hashable import make_hashable
+from django.utils.regex_helper import _lazy_re_compile
 
 
 class SQLCompiler:
+    # Multiline ordering SQL clause may appear from RawSQL.
+    ordering_parts = _lazy_re_compile(
+        r'^(.*)\s(?:ASC|DESC).*',
+        re.MULTILINE | re.DOTALL,
+    )
+
     def __init__(self, query, connection, using):
         self.query = query
         self.connection = connection
@@ -31,8 +38,6 @@ class SQLCompiler:
         self.select = None
         self.annotation_col_map = None
         self.klass_info = None
-        # Multiline ordering SQL clause may appear from RawSQL.
-        self.ordering_parts = re.compile(r'^(.*)\s(ASC|DESC)(.*)', re.MULTILINE | re.DOTALL)
         self._meta_ordering = None
 
     def setup_query(self):