support SQLAlchemy 1.4.28+

[tswast]

sqlalchemy.exc.SAWarning: Dialect bigquery:bigquery will not make use of SQL compilation caching as it does not set the 'supports_statement_cache' attribute to True. This can have significant performance implications including some performance degradations in comparison to prior SQLAlchemy versions. Dialect maintainers should seek to set this attribute to True after appropriate development and testing for SQLAlchemy 1.4 caching support. Alternatively, this attribute may be set to False which will disable this warning. (Background on this error at: https://sqlalche.me/e/14/cprf)

https://source.cloud.google.com/results/invocations/98c79c9a-dc03-49b5-bba9-db389866d284/targets/cloud-devrel%2Fclient-libraries%2Fpython%2Fgoogleapis%2Fpython-bigquery-sqlalchemy%2Fpresubmit%2Fpresubmit/log

More info here: https://sqlalche.me/e/14/cprf

Also, I recall caching may have been the root cause in #368 ?

[tswast]

#384 capped the maximum version of SQLAlchemy due to these failing compliance tests. Version 1.4.25 is the last known working version, but we just know that it started failing between 1.4.25 and 1.4.29.

It's not clear if something changed with SQLAlchemy that started this breakage or the compliance tests need additional configuration or a bit of both.

See #386 for more information.

[tswast]

I know we won't be able to support 1.4.29, but I'll try to expand support as much as we can in #391

[tswast]

1.4.28 fails with similar errors to 1.4.29.

https://source.cloud.google.com/results/invocations/e36ef56c-83ea-49b9-816f-6680c0dfef60/targets/cloud-devrel%2Fclient-libraries%2Fpython%2Fgoogleapis%2Fpython-bigquery-sqlalchemy%2Fpresubmit%2Fpresubmit/log

[tswast]

1.4.27 has fewer failures, but still fails

___________ ExpandingBoundInTest_bigquery+bigquery.test_typed_str_in ___________
Traceback (most recent call last):
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/.nox/compliance-3-10/lib/python3.10/site-packages/sqlalchemy/testing/suite/test_select.py", line 1147, in test_typed_str_in
    self._assert_result(
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/.nox/compliance-3-10/lib/python3.10/site-packages/sqlalchemy/testing/suite/test_select.py", line 1020, in _assert_result
    eq_(conn.execute(select, params).fetchall(), result)
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/.nox/compliance-3-10/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 1289, in execute
    return meth(self, multiparams, params, _EMPTY_EXECUTION_OPTS)
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/.nox/compliance-3-10/lib/python3.10/site-packages/sqlalchemy/sql/elements.py", line 325, in _execute_on_connection
    return connection._execute_clauseelement(
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/.nox/compliance-3-10/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 1473, in _execute_clauseelement
    compiled_sql, extracted_params, cache_hit = elem._compile_w_cache(
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/.nox/compliance-3-10/lib/python3.10/site-packages/sqlalchemy/sql/elements.py", line 533, in _compile_w_cache
    compiled_sql = self._compiler(
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/.nox/compliance-3-10/lib/python3.10/site-packages/sqlalchemy/sql/elements.py", line 555, in _compiler
    return dialect.statement_compiler(dialect, self, **kw)
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/sqlalchemy_bigquery/base.py", line 192, in __init__
    super(BigQueryCompiler, self).__init__(dialect, statement, *args, **kwargs)
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/.nox/compliance-3-10/lib/python3.10/site-packages/sqlalchemy/sql/compiler.py", line 776, in __init__
    Compiled.__init__(self, dialect, statement, **kwargs)
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/.nox/compliance-3-10/lib/python3.10/site-packages/sqlalchemy/sql/compiler.py", line 451, in __init__
    self.string = self.process(self.statement, **compile_kwargs)
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/.nox/compliance-3-10/lib/python3.10/site-packages/sqlalchemy/sql/compiler.py", line 486, in process
    return obj._compiler_dispatch(self, **kwargs)
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/.nox/compliance-3-10/lib/python3.10/site-packages/sqlalchemy/sql/visitors.py", line 82, in _compiler_dispatch
    return meth(self, **kw)
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/.nox/compliance-3-10/lib/python3.10/site-packages/sqlalchemy/sql/compiler.py", line 1590, in visit_textclause
    BIND_PARAMS.sub(
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/.nox/compliance-3-10/lib/python3.10/site-packages/sqlalchemy/sql/compiler.py", line 1574, in do_bindparam
    return self.process(textclause._bindparams[name], **kw)
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/.nox/compliance-3-10/lib/python3.10/site-packages/sqlalchemy/sql/compiler.py", line 486, in process
    return obj._compiler_dispatch(self, **kwargs)
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/.nox/compliance-3-10/lib/python3.10/site-packages/sqlalchemy/sql/visitors.py", line 82, in _compiler_dispatch
    return meth(self, **kw)
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/sqlalchemy_bigquery/base.py", line 525, in visit_bindparam
    assert_(self.__expanded_param(param), f"Unexpected param: {param}")
  File "/tmpfs/src/github/python-bigquery-sqlalchemy/sqlalchemy_bigquery/base.py", line 68, in assert_
    raise AssertionError(message)
AssertionError: Unexpected param: (__[POSTCOMPILE_q])
- generated xml file: /tmpfs/src/github/python-bigquery-sqlalchemy/compliance_3.10_sponge_log.xml -

https://source.cloud.google.com/results/invocations/2cc08719-cc62-45a9-a5f0-e0260888937c/targets