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test: look for transaction info on child job, not parent job #978

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Merged
plamut merged 3 commits into from
Sep 21, 2021
Merged

test: look for transaction info on child job, not parent job #978

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75f705b
test: look for transaction info on child job, not parent job
tswast Sep 21, 2021
b1e64e9
clarify transaction_info docstring
tswast Sep 21, 2021
536342a
use sphinx method directive
tswast Sep 21, 2021
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5 changes: 5 additions & 0 deletions google/cloud/bigquery/job/base.py
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Expand Up @@ -357,6 +357,11 @@ def reservation_usage(self):
def transaction_info(self) -> Optional[TransactionInfo]:
"""Information of the multi-statement transaction if this job is part of one.

Since a scripting query job can execute multiple transactions, this
property is only expected on child jobs. Use the
:meth:`google.cloud.bigquery.client.Client.list_jobs` method with the
``parent_job`` parameter to iterate over child jobs.

.. versionadded:: 2.24.0
"""
info = self._properties.get("statistics", {}).get("transactionInfo")
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12 changes: 9 additions & 3 deletions tests/system/test_client.py
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Expand Up @@ -1586,9 +1586,15 @@ def test_transaction_info(self):
query_job = Config.CLIENT.query(sql)
query_job.result()

# Transaction ID set by the server should be accessible
assert query_job.transaction_info is not None
assert query_job.transaction_info.transaction_id != ""
child_jobs = Config.CLIENT.list_jobs(parent_job=query_job)
begin_transaction_job = next(iter(child_jobs))

# Transaction ID set by the server should be accessible on the child
# job responsible for `BEGIN TRANSACTION`. It is not expected to be
# present on the parent job itself.
# https://github.com/googleapis/python-bigquery/issues/975
assert begin_transaction_job.transaction_info is not None
assert begin_transaction_job.transaction_info.transaction_id != ""

def test_dbapi_w_standard_sql_types(self):
for sql, expected in helpers.STANDARD_SQL_EXAMPLES:
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