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@tswast bump, please review

Looks like everything is working well except for the type annotations:

nox > Running session mypy
nox > Creating virtual environment (virtualenv) using python3.8 in .nox/mypy
nox > python -m pip install -e '.[all]'
nox > python -m pip install mypy==1.6.1
nox > python -m pip install types-protobuf types-python-dateutil types-requests types-setuptools
nox > mypy -p google --show-traceback
google/cloud/bigquery/query.py:472: error: Cannot call function of unknown type  [operator]
google/cloud/bigquery/query.py:629: error: Cannot call function of unknown type  [operator]
google/cloud/bigquery/query.py:778: error: Cannot call function of unknown type  [operator]
Found 3 errors in 1 file (checked 54 source files)
nox > Command mypy -p google --show-traceback failed with exit code 1
nox > Session mypy failed.

This change is causing the following error for insert_rows:

TypeError: _json_from_json() missing 1 required positional argument: 'field'

Is there a recommended fix for this?

Thanks @MartijnvanElferen for the report. I've filed #1756 to investigate further.

As a workaround insert_rows_json should avoid this type conversion code, but you're responsible for putting things in a format the BigQuery REST API understands.

@MartijnvanElferen Fix pending: #1757

Note: this PR will change the behavior of JSON data in insert_rows to call json.dumps, which is consistent with the new behavior of calling json.loads when reading row values. Previously, JSON support was happening via a generic fallback that didn't do any conversion of values passed in.

Thanks, @tswast. I'll refactor a couple of things to avoid the type conversion. Looking forward to the fix at the same time!