BUG: Fix import for new versions of ibis

[gerrymanoim]

The compiler is now at https://github.com/ibis-project/ibis/blob/master/ibis/backends/base_sql/compiler.py

[jreback]

@tswast any issues here?

[jreback]

cc @gerrymanoim https://github.com/ibis-project/ibis-bigquery/pull/59/checks?check_run_id=2630857440

[tswast]

I'd also like to make sure we maintain compatibility with ibis 1.4.0. At least until there are a few 2.x releases. I see there are some failing test in that build. https://github.com/ibis-project/ibis-bigquery/pull/59/checks?check_run_id=2630857546

e.g.

Run python -m pytest tests/unit
============================= test session starts ==============================
platform linux -- Python 3.8.5, pytest-6.2.4, py-1.10.0, pluggy-0.13.1
rootdir: /home/runner/work/ibis-bigquery/ibis-bigquery
collected 2 items / 4 errors

==================================== ERRORS ====================================
__________________ ERROR collecting tests/unit/test_client.py __________________
tests/unit/test_client.py:4: in <module>
    import ibis_bigquery.client
ibis_bigquery/__init__.py:11: in <module>
    from .client import (BigQueryClient, BigQueryDatabase, BigQueryQuery,
ibis_bigquery/client.py:28: in <module>
    from . import compiler as comp
ibis_bigquery/compiler.py:71: in <module>
    class BigQuerySelectBuilder(comp.SelectBuilder):
E   AttributeError: module 'ibis.backends.base_sql.compiler' has no attribute 'SelectBuilder'
_________________ ERROR collecting tests/unit/test_compiler.py _________________

[gerrymanoim]

Sorry about that - I added another try/except so that the CI now passes: gerrymanoim#1.

If I understand the github actions file, github should test against head of ibis master?

[jreback]

lgtm

[jreback]

cc @tswast

[gerrymanoim]

Sorry there are a few more places that need to be updated - will follow up in a bit.

[jreback]

agree this is not pretty. @gerrymanoim can you create an issue to remove this code once ibis-bigquery drops support for ibis < 2.0 (which we should release soon anyhow).

[gerrymanoim]

#62