Revert automatic set of sequence start to 1

The :class:`.Sequence` construct restores itself to the DDL behavior it
had prior to the 1.4 series, where creating a :class:`.Sequence` with
no additional arguments will emit a simple ``CREATE SEQUENCE`` instruction
**without** any additional parameters for "start value".   For most backends,
this is how things worked previously in any case; **however**, for
MS SQL Server, the default value on this database is
``-2**63``; to prevent this generally impractical default
from taking effect on SQL Server, the :paramref:`.Sequence.start` parameter
should be provided.   As usage of :class:`.Sequence` is unusual
for SQL Server which for many years has standardized on ``IDENTITY``,
it is hoped that this change has minimal impact.

Fixes: #7211
Change-Id: I1207ea10c8cb1528a1519a0fb3581d9621c27b31

1 files changed, 5 insertions, 1 deletions

diff --git a/test/sql/test_selectable.py b/test/sql/test_selectable.py
index 72c8dc28d..05847b1d0 100644
--- a/test/sql/test_selectable.py
+++ b/test/sql/test_selectable.py
@@ -50,6 +50,7 @@ from sqlalchemy.testing import assert_raises
 from sqlalchemy.testing import assert_raises_message
 from sqlalchemy.testing import AssertsCompiledSQL
 from sqlalchemy.testing import AssertsExecutionResults
+from sqlalchemy.testing import config
 from sqlalchemy.testing import eq_
 from sqlalchemy.testing import fixtures
 from sqlalchemy.testing import in_
@@ -57,6 +58,7 @@ from sqlalchemy.testing import is_
 from sqlalchemy.testing import is_not
 from sqlalchemy.testing import ne_
 from sqlalchemy.testing.assertions import expect_raises_message
+from sqlalchemy.testing.provision import normalize_sequence
 
 
 metadata = MetaData()
@@ -2705,7 +2707,9 @@ class ReduceTest(fixtures.TestBase, AssertsExecutionResults):
             Column(
                 "person_id",
                 Integer,
-                Sequence("person_id_seq", optional=True),
+                normalize_sequence(
+                    config, Sequence("person_id_seq", optional=True)
+                ),
                 primary_key=True,
             ),
             Column("name", String(50)),