From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Sun, 29 Mar 2020 16:06:29 +0000 (-0400)
Subject: Repair queries from #5134 to ORDER BY outside the subquery
X-Git-Tag: rel_1_4_0b1~436^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=48eb5180dd07600eddc3dbda8fe09666211b3cc9;p=thirdparty%2Fsqlalchemy%2Fsqlalchemy.git

Repair queries from #5134 to ORDER BY outside the subquery

ORDER BY has to be on the outermost query to guarantee ordering
as these tests were failing for SQL Server.   Also add
new tests that don't use from_self() as this is also going to
be removed in 2.0.

Also propose some from_self() alternatives.  References #5221

Change-Id: Ia2a669f45fcaada607e73d9225849fd74d25f6e5
---

diff --git a/test/orm/test_query.py b/test/orm/test_query.py
index 7d49aceba7..b0d1897e4c 100644
--- a/test/orm/test_query.py
+++ b/test/orm/test_query.py
@@ -3889,7 +3889,12 @@ class DistinctTest(QueryTest, AssertsCompiledSQL):
             .all(),
         )
 
-    def test_columns_augmented_roundtrip_one(self):
+    def test_columns_augmented_roundtrip_one_from_self(self):
+        """Test workaround for legacy style DISTINCT on extra column.
+
+        See #5134
+
+        """
         User, Address = self.classes.User, self.classes.Address
 
         sess = create_session()
@@ -3897,13 +3902,42 @@ class DistinctTest(QueryTest, AssertsCompiledSQL):
             sess.query(User, Address.email_address)
             .join("addresses")
             .distinct()
-            .order_by(desc(Address.email_address))
             .from_self(User)
+            .order_by(desc(Address.email_address))
         )
 
         eq_([User(id=7), User(id=9), User(id=8)], q.all())
 
+    def test_columns_augmented_roundtrip_one_aliased(self):
+        """Test workaround for legacy style DISTINCT on extra column,
+        but also without using from_self().
+
+        See #5134
+
+        """
+        User, Address = self.classes.User, self.classes.Address
+
+        sess = create_session()
+        q = (
+            sess.query(User, Address.email_address)
+            .join("addresses")
+            .distinct()
+        )
+
+        subq = q.subquery()
+
+        entity = aliased(User, subq)
+        q = sess.query(entity).order_by(subq.c.email_address.desc())
+
+        eq_([User(id=7), User(id=9), User(id=8)], q.all())
+
     def test_columns_augmented_roundtrip_two(self):
+        """Test workaround for legacy style DISTINCT on extra column.
+
+        See #5134
+
+        """
+
         User, Address = self.classes.User, self.classes.Address
 
         sess = create_session()
@@ -3926,7 +3960,13 @@ class DistinctTest(QueryTest, AssertsCompiledSQL):
 
         self.assert_sql_count(testing.db, go, 1)
 
-    def test_columns_augmented_roundtrip_three(self):
+    def test_columns_augmented_roundtrip_three_from_self(self):
+        """Test workaround for legacy style DISTINCT on extra column.
+
+        See #5134
+
+        """
+
         User, Address = self.classes.User, self.classes.Address
 
         sess = create_session()
@@ -3942,11 +3982,10 @@ class DistinctTest(QueryTest, AssertsCompiledSQL):
             .filter(User.name == "jack")
             .filter(User.id + Address.user_id > 0)
             .distinct()
-            .order_by(User.id, User.name, Address.email_address)
             .from_self(User.id, User.name.label("foo"), Address.id)
+            .order_by(User.id, User.name, Address.email_address)
         )
 
-        # even though columns are added, they aren't in the result
         eq_(
             q.all(),
             [
@@ -3960,6 +3999,55 @@ class DistinctTest(QueryTest, AssertsCompiledSQL):
         for row in q:
             eq_(row._mapping.keys(), ["id", "foo", "id"])
 
+    def test_columns_augmented_roundtrip_three_aliased(self):
+        """Test workaround for legacy style DISTINCT on extra column,
+        but also without using from_self().
+
+        See #5134
+
+        """
+
+        User, Address = self.classes.User, self.classes.Address
+
+        sess = create_session()
+
+        q = (
+            sess.query(
+                User.id,
+                User.name.label("foo"),
+                Address.id,
+                Address.email_address,
+            )
+            .join(Address, true())
+            .filter(User.name == "jack")
+            .filter(User.id + Address.user_id > 0)
+            .distinct()
+        )
+
+        # TODO: this should warn for ambiguous labels when the flag
+        # is not present;  is this flag also in core?  See issue #5221
+        subq = q.subquery(with_labels=True)
+
+        # note this is a bit cutting edge; two differnet entities against
+        # the same subquery.
+        uentity = aliased(User, subq)
+        aentity = aliased(Address, subq)
+
+        q = sess.query(
+            uentity.id, uentity.name.label("foo"), aentity.id
+        ).order_by(uentity.id, uentity.name, aentity.email_address)
+
+        eq_(
+            q.all(),
+            [
+                (7, "jack", 3),
+                (7, "jack", 4),
+                (7, "jack", 2),
+                (7, "jack", 5),
+                (7, "jack", 1),
+            ],
+        )
+
     def test_columns_augmented_sql_one(self):
         User, Address = self.classes.User, self.classes.Address