feat: add default LoadJobConfig to Client

google/cloud/bigquery/client.py

@@ -210,6 +210,9 @@ class Client(ClientWithProject):
         default_query_job_config (Optional[google.cloud.bigquery.job.QueryJobConfig]):
             Default ``QueryJobConfig``.
             Will be merged into job configs passed into the ``query`` method.
+        default_load_job_config (Optional[google.cloud.bigquery.job.LoadJobConfig]):
+            Default ``LoadJobConfig``.
+            Will be merged into job configs passed into the ``load_table_*`` methods.
         client_info (Optional[google.api_core.client_info.ClientInfo]):
             The client info used to send a user-agent string along with API
             requests. If ``None``, then default info will be used. Generally,
@@ -235,6 +238,7 @@ def __init__(
         _http=None,
         location=None,
         default_query_job_config=None,
+        default_load_job_config=None,
         client_info=None,
         client_options=None,
     ) -> None:
@@ -260,6 +264,7 @@ def __init__(
         self._connection = Connection(self, **kw_args)
         self._location = location
         self._default_query_job_config = copy.deepcopy(default_query_job_config)
+        self._default_load_job_config = copy.deepcopy(default_load_job_config)
 
     @property
     def location(self):
@@ -277,6 +282,17 @@ def default_query_job_config(self):
     def default_query_job_config(self, value: QueryJobConfig):
         self._default_query_job_config = copy.deepcopy(value)
 
+    @property
+    def default_load_job_config(self):
+        """Default ``LoadJobConfig``.
+        Will be merged into job configs passed into the ``load_table_*`` methods.
+        """
+        return self._default_load_job_config
+
+    @default_load_job_config.setter
+    def default_load_job_config(self, value: LoadJobConfig):
+        self._default_load_job_config = copy.deepcopy(value)
+
     def close(self):
         """Close the underlying transport objects, releasing system resources.
 
@@ -2330,8 +2346,8 @@ def load_table_from_uri(
 
         Raises:
             TypeError:
-                If ``job_config`` is not an instance of :class:`~google.cloud.bigquery.job.LoadJobConfig`
-                class.
+                If ``job_config`` is not an instance of
+                :class:`~google.cloud.bigquery.job.LoadJobConfig` class.
         """
         job_id = _make_job_id(job_id, job_id_prefix)
 
@@ -2348,11 +2364,14 @@ def load_table_from_uri(
 
         destination = _table_arg_to_table_ref(destination, default_project=self.project)
 
-        if job_config:
-            job_config = copy.deepcopy(job_config)
-            _verify_job_config_type(job_config, google.cloud.bigquery.job.LoadJobConfig)
+        if job_config is not None:
+            _verify_job_config_type(job_config, LoadJobConfig)
+        else:
+            job_config = job.LoadJobConfig()
 
-        load_job = job.LoadJob(job_ref, source_uris, destination, self, job_config)
+        new_job_config = job_config._fill_from_default(self._default_load_job_config)
+
+        load_job = job.LoadJob(job_ref, source_uris, destination, self, new_job_config)
         load_job._begin(retry=retry, timeout=timeout)
 
         return load_job
@@ -2424,8 +2443,8 @@ def load_table_from_file(
                 mode.
 
             TypeError:
-                If ``job_config`` is not an instance of :class:`~google.cloud.bigquery.job.LoadJobConfig`
-                class.
+                If ``job_config`` is not an instance of
+                :class:`~google.cloud.bigquery.job.LoadJobConfig` class.
         """
         job_id = _make_job_id(job_id, job_id_prefix)
 
@@ -2437,10 +2456,15 @@ def load_table_from_file(
 
         destination = _table_arg_to_table_ref(destination, default_project=self.project)
         job_ref = job._JobReference(job_id, project=project, location=location)
-        if job_config:
-            job_config = copy.deepcopy(job_config)
-            _verify_job_config_type(job_config, google.cloud.bigquery.job.LoadJobConfig)
-        load_job = job.LoadJob(job_ref, None, destination, self, job_config)
+
+        if job_config is not None:
+            _verify_job_config_type(job_config, LoadJobConfig)
+        else:
+            job_config = job.LoadJobConfig()
+
+        new_job_config = job_config._fill_from_default(self._default_load_job_config)
+
+        load_job = job.LoadJob(job_ref, None, destination, self, new_job_config)
         job_resource = load_job.to_api_repr()
 
         if rewind:
@@ -2564,43 +2588,40 @@ def load_table_from_dataframe(
                 If a usable parquet engine cannot be found. This method
                 requires :mod:`pyarrow` to be installed.
             TypeError:
-                If ``job_config`` is not an instance of :class:`~google.cloud.bigquery.job.LoadJobConfig`
-                class.
+                If ``job_config`` is not an instance of
+                :class:`~google.cloud.bigquery.job.LoadJobConfig` class.
         """
         job_id = _make_job_id(job_id, job_id_prefix)
 
-        if job_config:
-            _verify_job_config_type(job_config, google.cloud.bigquery.job.LoadJobConfig)
-            # Make a copy so that the job config isn't modified in-place.
-            job_config_properties = copy.deepcopy(job_config._properties)
-            job_config = job.LoadJobConfig()
-            job_config._properties = job_config_properties
-
+        if job_config is not None:
+            _verify_job_config_type(job_config, LoadJobConfig)
         else:
             job_config = job.LoadJobConfig()
 
+        new_job_config = job_config._fill_from_default(self._default_load_job_config)
+
         supported_formats = {job.SourceFormat.CSV, job.SourceFormat.PARQUET}
-        if job_config.source_format is None:
+        if new_job_config.source_format is None:
             # default value
-            job_config.source_format = job.SourceFormat.PARQUET
+            new_job_config.source_format = job.SourceFormat.PARQUET
 
         if (
-            job_config.source_format == job.SourceFormat.PARQUET
-            and job_config.parquet_options is None
+            new_job_config.source_format == job.SourceFormat.PARQUET
+            and new_job_config.parquet_options is None
         ):
             parquet_options = ParquetOptions()
             # default value
             parquet_options.enable_list_inference = True
-            job_config.parquet_options = parquet_options
+            new_job_config.parquet_options = parquet_options
 
-        if job_config.source_format not in supported_formats:
+        if new_job_config.source_format not in supported_formats:
             raise ValueError(
                 "Got unexpected source_format: '{}'. Currently, only PARQUET and CSV are supported".format(
-                    job_config.source_format
+                    new_job_config.source_format
                 )
             )
 
-        if pyarrow is None and job_config.source_format == job.SourceFormat.PARQUET:
+        if pyarrow is None and new_job_config.source_format == job.SourceFormat.PARQUET:
             # pyarrow is now the only supported parquet engine.
             raise ValueError("This method requires pyarrow to be installed")
 
@@ -2611,8 +2632,8 @@ def load_table_from_dataframe(
         # schema, and check if dataframe schema is compatible with it - except
         # for WRITE_TRUNCATE jobs, the existing schema does not matter then.
         if (
-            not job_config.schema
-            and job_config.write_disposition != job.WriteDisposition.WRITE_TRUNCATE
+            not new_job_config.schema
+            and new_job_config.write_disposition != job.WriteDisposition.WRITE_TRUNCATE
         ):
             try:
                 table = self.get_table(destination)
@@ -2623,7 +2644,7 @@ def load_table_from_dataframe(
                     name
                     for name, _ in _pandas_helpers.list_columns_and_indexes(dataframe)
                 )
-                job_config.schema = [
+                new_job_config.schema = [
                     # Field description and policy tags are not needed to
                     # serialize a data frame.
                     SchemaField(
@@ -2637,11 +2658,11 @@ def load_table_from_dataframe(
                     if field.name in columns_and_indexes
                 ]
 
-        job_config.schema = _pandas_helpers.dataframe_to_bq_schema(
-            dataframe, job_config.schema
+        new_job_config.schema = _pandas_helpers.dataframe_to_bq_schema(
+            dataframe, new_job_config.schema
         )
 
-        if not job_config.schema:
+        if not new_job_config.schema:
             # the schema could not be fully detected
             warnings.warn(
                 "Schema could not be detected for all columns. Loading from a "
@@ -2652,13 +2673,13 @@ def load_table_from_dataframe(
             )
 
         tmpfd, tmppath = tempfile.mkstemp(
-            suffix="_job_{}.{}".format(job_id[:8], job_config.source_format.lower())
+            suffix="_job_{}.{}".format(job_id[:8], new_job_config.source_format.lower())
         )
         os.close(tmpfd)
 
         try:
 
-            if job_config.source_format == job.SourceFormat.PARQUET:
+            if new_job_config.source_format == job.SourceFormat.PARQUET:
                 if _PYARROW_VERSION in _PYARROW_BAD_VERSIONS:
                     msg = (
                         "Loading dataframe data in PARQUET format with pyarrow "
@@ -2669,13 +2690,13 @@ def load_table_from_dataframe(
                     )
                     warnings.warn(msg, category=RuntimeWarning)
 
-                if job_config.schema:
+                if new_job_config.schema:
                     if parquet_compression == "snappy":  # adjust the default value
                         parquet_compression = parquet_compression.upper()
 
                     _pandas_helpers.dataframe_to_parquet(
                         dataframe,
-                        job_config.schema,
+                        new_job_config.schema,
                         tmppath,
                         parquet_compression=parquet_compression,
                         parquet_use_compliant_nested_type=True,
@@ -2715,7 +2736,7 @@ def load_table_from_dataframe(
                     job_id_prefix=job_id_prefix,
                     location=location,
                     project=project,
-                    job_config=job_config,
+                    job_config=new_job_config,
                     timeout=timeout,
                 )
 
@@ -2791,22 +2812,22 @@ def load_table_from_json(
 
         Raises:
             TypeError:
-                If ``job_config`` is not an instance of :class:`~google.cloud.bigquery.job.LoadJobConfig`
-                class.
+                If ``job_config`` is not an instance of
+                :class:`~google.cloud.bigquery.job.LoadJobConfig` class.
         """
         job_id = _make_job_id(job_id, job_id_prefix)
 
-        if job_config:
-            _verify_job_config_type(job_config, google.cloud.bigquery.job.LoadJobConfig)
-            # Make a copy so that the job config isn't modified in-place.
-            job_config = copy.deepcopy(job_config)
+        if job_config is not None:
+            _verify_job_config_type(job_config, LoadJobConfig)
         else:
             job_config = job.LoadJobConfig()
 
-        job_config.source_format = job.SourceFormat.NEWLINE_DELIMITED_JSON
+        new_job_config = job_config._fill_from_default(self._default_load_job_config)
+
+        new_job_config.source_format = job.SourceFormat.NEWLINE_DELIMITED_JSON
 
-        if job_config.schema is None:
-            job_config.autodetect = True
+        if new_job_config.schema is None:
+            new_job_config.autodetect = True
 
         if project is None:
             project = self.project
@@ -2828,7 +2849,7 @@ def load_table_from_json(
             job_id_prefix=job_id_prefix,
             location=location,
             project=project,
-            job_config=job_config,
+            job_config=new_job_config,
             timeout=timeout,
         )
 

google/cloud/bigquery/job/base.py

@@ -269,7 +269,7 @@ def to_api_repr(self) -> dict:
         """
         return copy.deepcopy(self._properties)
 
-    def _fill_from_default(self, default_job_config):
+    def _fill_from_default(self, default_job_config=None):
         """Merge this job config with a default job config.
 
         The keys in this object take precedence over the keys in the default
@@ -283,6 +283,10 @@ def _fill_from_default(self, default_job_config):
         Returns:
             google.cloud.bigquery.job._JobConfig: A new (merged) job config.
         """
+        if not default_job_config:
+            new_job_config = copy.deepcopy(self)
+            return new_job_config
+
         if self._job_type != default_job_config._job_type:
             raise TypeError(
                 "attempted to merge two incompatible job types: "

tests/system/test_client.py

@@ -2319,7 +2319,7 @@ def _table_exists(t):
         return False
 
 
-def test_dbapi_create_view(dataset_id):
+def test_dbapi_create_view(dataset_id: str):
 
     query = f"""
     CREATE VIEW {dataset_id}.dbapi_create_view
@@ -2332,7 +2332,7 @@ def test_dbapi_create_view(dataset_id):
     assert Config.CURSOR.rowcount == 0, "expected 0 rows"
 
 
-def test_parameterized_types_round_trip(dataset_id):
+def test_parameterized_types_round_trip(dataset_id: str):
     client = Config.CLIENT
     table_id = f"{dataset_id}.test_parameterized_types_round_trip"
     fields = (
@@ -2358,7 +2358,7 @@ def test_parameterized_types_round_trip(dataset_id):
     assert tuple(s._key()[:2] for s in table2.schema) == fields
 
 
-def test_table_snapshots(dataset_id):
+def test_table_snapshots(dataset_id: str):
     from google.cloud.bigquery import CopyJobConfig
     from google.cloud.bigquery import OperationType
 
@@ -2429,7 +2429,7 @@ def test_table_snapshots(dataset_id):
     assert rows == [(1, "one"), (2, "two")]
 
 
-def test_table_clones(dataset_id):
+def test_table_clones(dataset_id: str):
     from google.cloud.bigquery import CopyJobConfig
     from google.cloud.bigquery import OperationType
 

tests/unit/job/test_base.py

@@ -1104,7 +1104,7 @@ def test_ctor_with_unknown_property_raises_error(self):
             config = self._make_one()
             config.wrong_name = None
 
-    def test_fill_from_default(self):
+    def test_fill_query_job_config_from_default(self):
         from google.cloud.bigquery import QueryJobConfig
 
         job_config = QueryJobConfig()
@@ -1120,6 +1120,22 @@ def test_fill_from_default(self):
         self.assertTrue(final_job_config.use_query_cache)
         self.assertEqual(final_job_config.maximum_bytes_billed, 1000)
 
+    def test_fill_load_job_from_default(self):
+        from google.cloud.bigquery import LoadJobConfig
+
+        job_config = LoadJobConfig()
+        job_config.create_session = True
+        job_config.encoding = "UTF-8"
+
+        default_job_config = LoadJobConfig()
+        default_job_config.ignore_unknown_values = True
+        default_job_config.encoding = "ISO-8859-1"
+
+        final_job_config = job_config._fill_from_default(default_job_config)
+        self.assertTrue(final_job_config.create_session)
+        self.assertTrue(final_job_config.ignore_unknown_values)
+        self.assertEqual(final_job_config.encoding, "UTF-8")
+
     def test_fill_from_default_conflict(self):
         from google.cloud.bigquery import QueryJobConfig
 
@@ -1132,6 +1148,17 @@ def test_fill_from_default_conflict(self):
         with self.assertRaises(TypeError):
             basic_job_config._fill_from_default(conflicting_job_config)
 
+    def test_fill_from_empty_default_conflict(self):
+        from google.cloud.bigquery import QueryJobConfig
+
+        job_config = QueryJobConfig()
+        job_config.dry_run = True
+        job_config.maximum_bytes_billed = 1000
+
+        final_job_config = job_config._fill_from_default(default_job_config=None)
+        self.assertTrue(final_job_config.dry_run)
+        self.assertEqual(final_job_config.maximum_bytes_billed, 1000)
+
     @mock.patch("google.cloud.bigquery._helpers._get_sub_prop")
     def test__get_sub_prop_wo_default(self, _get_sub_prop):
         job_config = self._make_one()