task: metadata: install: pip install -e .[all]
patch: diff --git a/google/cloud/bigquery/retry.py b/google/cloud/bigquery/retry.py
index c9898287..11103451 100644
--- a/google/cloud/bigquery/retry.py
+++ b/google/cloud/bigquery/retry.py
@@ -119,6 +119,14 @@ def _job_should_retry(exc):
     if isinstance(exc, exceptions.RetryError):
         exc = exc.cause
 
+    # Per https://github.com/googleapis/python-bigquery/issues/1929, sometimes
+    # retriable errors make their way here. Because of the separate
+    # `restart_query_job` logic to make sure we aren't restarting non-failed
+    # jobs, it should be safe to continue and not totally fail our attempt at
+    # waiting for the query to complete.
+    if _should_retry(exc):
+        return True
+
     if not hasattr(exc, "errors") or len(exc.errors) == 0:
         return False
 

problem_statement: Retry requests.exceptions.ConnectionError
Hi Team,

Could you add a retry to this exception? We are running this code in Cloud Function and GKE infrastructure from time to time we get these errors

Bigquery SDK == google-cloud-bigquery==3.18.0

```
Error Type: <class 'requests.exceptions.ConnectionError'> error: ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer')) 
Traceback (most recent call last): File "/workspace/visionCommon/common.py", line 117, 
in wrapper return func(*args, **kwargs) File "/workspace/main.py", line 576, in controller current_step = check_eligibility() File "/workspace/main.py", line 314, 
in check_eligibility total_rows = service.execute_query(query).result().total_rows File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/cloud/bigquery/job/query.py", line 1595, 
in result do_get_result() File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/api_core/retry/retry_unary.py", line 293, 
in retry_wrapped_func return retry_target( File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/api_core/retry/retry_unary.py", line 153, 
in retry_target _retry_error_helper( File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/api_core/retry/retry_base.py", line 212, 
in _retry_error_helper raise final_exc from source_exc File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/api_core/retry/retry_unary.py", line 144, 
in retry_target result = target() File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/cloud/bigquery/job/query.py", line 1584, 
in do_get_result super(QueryJob, self).result(retry=retry, timeout=timeout) File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/cloud/bigquery/job/base.py", line 971, 
in result return super(_AsyncJob, self).result(timeout=timeout, **kwargs) File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/api_core/future/polling.py", line 256, 
in result self._blocking_poll(timeout=timeout, retry=retry, polling=polling) File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/cloud/bigquery/job/query.py", line 1326, 
in _blocking_poll super(QueryJob, self)._blocking_poll(timeout=timeout, **kwargs) File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/api_core/future/polling.py", line 137, 
in _blocking_poll polling(self._done_or_raise)(retry=retry) File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/api_core/retry/retry_unary.py", line 293, 
in retry_wrapped_func return retry_target( File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/api_core/retry/retry_unary.py", line 153, 
in retry_target _retry_error_helper( File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/api_core/retry/retry_base.py", line 212, 
in _retry_error_helper raise final_exc from source_exc File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/api_core/retry/retry_unary.py", line 144, 
in retry_target result = target() File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/cloud/bigquery/job/query.py", line 1448, 
in _done_or_raise self._reload_query_results(retry=retry, timeout=transport_timeout) File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/cloud/bigquery/job/query.py", line 1429, 
in _reload_query_results self._query_results = self._client._get_query_results( File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/cloud/bigquery/client.py", line 1936, 
in _get_query_results resource = self._call_api( File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/cloud/bigquery/client.py", line 827, 
in _call_api return call() File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/cloud/_http/__init__.py", line 482, 
in api_request response = self._make_request( File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/cloud/_http/__init__.py", line 341, 
in _make_request return self._do_request( File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/cloud/_http/__init__.py", line 379, 
in _do_request return self.http.request( File "/layers/google.python.pip/pip/lib/python3.9/site-packages/google/auth/transport/requests.py", line 541, 
in request response = super(AuthorizedSession, self).request( File "/layers/google.python.pip/pip/lib/python3.9/site-packages/requests/sessions.py", line 589, 
in request resp = self.send(prep, **send_kwargs) File "/layers/google.python.pip/pip/lib/python3.9/site-packages/requests/sessions.py", line 703, 
in send r = adapter.send(request, **kwargs) File "/layers/google.python.pip/pip/lib/python3.9/site-packages/requests/adapters.py", line 501, 
in send raise ConnectionError(err, request=request) requests.exceptions.ConnectionError: ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer'))
```

 
repo: googleapis/python-bigquery
test_cmd: pytest --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning
test_patch: diff --git a/tests/unit/test_job_retry.py b/tests/unit/test_job_retry.py
index 43ddae1d..2dcc5878 100644
--- a/tests/unit/test_job_retry.py
+++ b/tests/unit/test_job_retry.py
@@ -21,6 +21,7 @@ import pytest
 import google.api_core.exceptions
 import google.api_core.retry
 import freezegun
+import requests.exceptions
 
 from google.cloud.bigquery.client import Client
 from google.cloud.bigquery import _job_helpers
@@ -126,6 +127,122 @@ def test_retry_failed_jobs(sleep, client, job_retry_on_query):
     assert job.job_id == orig_job_id
 
 
+def test_retry_connection_error_with_default_retries_and_successful_first_job(
+    monkeypatch, client
+):
+    """
+    Make sure ConnectionError can be retried at `is_job_done` level, even if
+    retries are exhaused by API-level retry.
+
+    Note: Because restart_query_job is set to True only in the case of a
+    confirmed job failure, this should be safe to do even when a job is not
+    idempotent.
+
+    Regression test for issue
+    https://github.com/googleapis/python-bigquery/issues/1929
+    """
+    job_counter = 0
+
+    def make_job_id(*args, **kwargs):
+        nonlocal job_counter
+        job_counter += 1
+        return f"{job_counter}"
+
+    monkeypatch.setattr(_job_helpers, "make_job_id", make_job_id)
+    conn = client._connection = make_connection()
+    project = client.project
+    job_reference_1 = {"projectId": project, "jobId": "1", "location": "test-loc"}
+    NUM_API_RETRIES = 2
+
+    with freezegun.freeze_time(
+        "2024-01-01 00:00:00",
+        # Note: because of exponential backoff and a bit of jitter,
+        # NUM_API_RETRIES will get less accurate the greater the value.
+        # We add 1 because we know there will be at least some additional
+        # calls to fetch the time / sleep before the retry deadline is hit.
+        auto_tick_seconds=(
+            google.cloud.bigquery.retry._DEFAULT_RETRY_DEADLINE / NUM_API_RETRIES
+        )
+        + 1,
+    ):
+        conn.api_request.side_effect = [
+            # jobs.insert
+            {"jobReference": job_reference_1, "status": {"state": "PENDING"}},
+            # jobs.get
+            {"jobReference": job_reference_1, "status": {"state": "RUNNING"}},
+            # jobs.getQueryResults x2
+            requests.exceptions.ConnectionError(),
+            requests.exceptions.ConnectionError(),
+            # jobs.get
+            # Job actually succeeeded, so we shouldn't be restarting the job,
+            # even though we are retrying at the `is_job_done` level.
+            {"jobReference": job_reference_1, "status": {"state": "DONE"}},
+            # jobs.getQueryResults
+            {"jobReference": job_reference_1, "jobComplete": True},
+        ]
+
+        job = client.query("select 1")
+        rows_iter = job.result()
+
+    assert job.done()  # Shouldn't make any additional API calls.
+    assert rows_iter is not None
+
+    # Should only have created one job, even though we did call job_retry.
+    assert job_counter == 1
+
+    # Double-check that we made the API calls we expected to make.
+    conn.api_request.assert_has_calls(
+        [
+            # jobs.insert
+            mock.call(
+                method="POST",
+                path="/projects/PROJECT/jobs",
+                data={
+                    "jobReference": {"jobId": "1", "projectId": "PROJECT"},
+                    "configuration": {
+                        "query": {"useLegacySql": False, "query": "select 1"}
+                    },
+                },
+                timeout=None,
+            ),
+            # jobs.get
+            mock.call(
+                method="GET",
+                path="/projects/PROJECT/jobs/1",
+                query_params={"location": "test-loc"},
+                timeout=None,
+            ),
+            # jobs.getQueryResults x2
+            mock.call(
+                method="GET",
+                path="/projects/PROJECT/queries/1",
+                query_params={"maxResults": 0, "location": "test-loc"},
+                timeout=None,
+            ),
+            mock.call(
+                method="GET",
+                path="/projects/PROJECT/queries/1",
+                query_params={"maxResults": 0, "location": "test-loc"},
+                timeout=None,
+            ),
+            # jobs.get -- is_job_done checking again
+            mock.call(
+                method="GET",
+                path="/projects/PROJECT/jobs/1",
+                query_params={"location": "test-loc"},
+                timeout=None,
+            ),
+            # jobs.getQueryResults
+            mock.call(
+                method="GET",
+                path="/projects/PROJECT/queries/1",
+                query_params={"maxResults": 0, "location": "test-loc"},
+                timeout=120,
+            ),
+        ],
+    )
+
+
 def test_query_retry_with_default_retry_and_ambiguous_errors_only_retries_with_failed_job(
     client, monkeypatch
 ):