Add tests for get_partitions_metadata

[jtcohen6]

Description

• Use get_partitions_metadata in existing integration tests for BigQuery table partition switching
• Re-add asterisk to raw_execute
• I started on (but did not complete) using adapter.get_partitions_metadata in the bq_insert_overwrite macro, instead of select max({{ partition_by.field }}) from {{ this }}, to save GBs—our initial goal, after all

Testing

Run this test via Docker + tox. You'll also need a JSON keyfile set to an env var named BIGQUERY_SERVICE_ACCOUNT_JSON in a file called test.env.

docker-compose run test tox -e explicit-py36 -- -s -x -m profile_bigquery test/integration/022_bigquery_test/test_bigquery_changing_partitions.py

[ran-eh]

Nice!