feat(bigquery): add bigquery_search_exclude_columns sample to search a table while excluding specific columns

Problem:
The BigQuery documentation (https://cloud.google.com/bigquery/docs/search)
needs a standalone, tested Python code sample demonstrating how to
search a table while excluding specific columns (region tag `bigquery_search_exclude_columns`).

Solution:
- Add `search_exclude_columns(project_id: str) -> None` in `bigquery/search/bigquery_search_exclude_columns.py`
  (Search all columns of a BigQuery table except specified excluded columns using SELECT AS STRUCT * EXCEPT(...).)
- Add unit tests (`bigquery/search/bigquery_search_exclude_columns_test.py`) covering both the success
  path and API error handling (`GoogleAPICallError`)

Author: iennae

bigquery/search/bigquery_search_exclude_columns.py

@@ -0,0 +1,84 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# [START bigquery_search_exclude_columns]
+import sys
+
+from google.api_core import exceptions
+from google.cloud import bigquery
+
+
+def search_exclude_columns(
+    project_id: str,
+) -> None:
+    """Searches a BigQuery table while excluding specific columns using EXCEPT.
+
+    Args:
+        project_id: Google Cloud project ID used to bill the query job
+            (for example, 'example-project').
+    """
+    client = bigquery.Client(project=project_id)
+    # Query the public theLook eCommerce dataset in bigquery-public-data
+    # (https://cloud.google.com/bigquery/public-data).
+    table_ref = "bigquery-public-data.thelook_ecommerce.users"
+    # Exclude street_address, city, state, and country from the searched fields using SELECT AS STRUCT ... EXCEPT.
+    search_query = "Nelson Apt"
+    job_config = bigquery.QueryJobConfig(
+        query_parameters=[
+            bigquery.ScalarQueryParameter("search_query", "STRING", search_query),
+        ]
+    )
+    sql = f"""
+        SELECT
+          u.id,
+          u.first_name,
+          u.last_name,
+          u.email
+        FROM `{table_ref}` AS u
+        WHERE SEARCH(
+          (SELECT AS STRUCT u.* EXCEPT (street_address, city, state, country)),
+          @search_query
+        )
+        ORDER BY u.id ASC
+        LIMIT 10;
+    """
+
+    try:
+        print(
+            f"Searching {table_ref} excluding address columns for term: {search_query}"
+        )
+        query_job = client.query(sql, job_config=job_config)
+        rows = list(query_job.result())
+    except exceptions.NotFound as err:
+        print(
+            f"error: table '{table_ref}' not found when querying from project "
+            f"'{project_id}': {err.message}",
+            file=sys.stderr,
+        )
+        return
+    except exceptions.GoogleAPICallError as err:
+        print(
+            f"error: failed to search '{table_ref}' with excluded columns in project "
+            f"'{project_id}': {err.message}",
+            file=sys.stderr,
+        )
+        return
+
+    print(f"Resource ID: {table_ref}")
+    print(f"Job ID: {query_job.job_id}")
+    print(f"Matching Rows: {len(rows)}")
+    print(f"Search Term: {search_query}")
+
+
+# [END bigquery_search_exclude_columns]

bigquery/search/bigquery_search_exclude_columns_test.py

@@ -0,0 +1,65 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from unittest import mock
+
+import bigquery_search_exclude_columns
+from google.api_core import exceptions
+import pytest
+
+
+def test_search_exclude_columns_success(
+    monkeypatch: pytest.MonkeyPatch,
+    capsys: pytest.CaptureFixture[str],
+) -> None:
+    mock_client = mock.MagicMock()
+    mock_job = mock.MagicMock()
+    mock_job.job_id = "example-job-123"
+    mock_job.result.return_value = []
+    mock_client.query.return_value = mock_job
+    monkeypatch.setattr(
+        bigquery_search_exclude_columns.bigquery,
+        "Client",
+        lambda project=None: mock_client,
+    )
+
+    bigquery_search_exclude_columns.search_exclude_columns(
+        project_id="example-project",
+    )
+
+    captured = capsys.readouterr()
+    assert "Resource ID: bigquery-public-data.thelook_ecommerce.users" in captured.out
+    assert "Matching Rows: 0" in captured.out
+    assert mock_client.query.called
+
+
+def test_search_exclude_columns_error(
+    monkeypatch: pytest.MonkeyPatch,
+    capsys: pytest.CaptureFixture[str],
+) -> None:
+    mock_client = mock.MagicMock()
+    mock_client.query.side_effect = exceptions.NotFound("resource error")
+    monkeypatch.setattr(
+        bigquery_search_exclude_columns.bigquery,
+        "Client",
+        lambda project=None: mock_client,
+    )
+
+    bigquery_search_exclude_columns.search_exclude_columns(
+        project_id="example-project",
+    )
+
+    captured = capsys.readouterr()
+    assert "error:" in captured.err
+    assert "example-project" in captured.err

bigquery/search/noxfile_config.py

@@ -0,0 +1,23 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+TEST_CONFIG_OVERRIDE = {
+    # You can opt out from the test for specific Python versions.
+    "ignored_versions": ["2.7", "3.7", "3.8", "3.9", "3.10", "3.11"],
+    # Enforce type hints on new samples.
+    "enforce_type_hints": True,
+    "gcloud_project_env": "GOOGLE_CLOUD_PROJECT",
+    "pip_version_override": None,
+    "envs": {},
+}

bigquery/search/requirements-test.txt

@@ -0,0 +1 @@
+pytest==9.0.3; python_version >= "3.10"

bigquery/search/requirements.txt

@@ -0,0 +1 @@
+google-cloud-bigquery==3.47.0