Add changelog/release notes for BigQuery.

bigquery/CHANGELOG.md

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+# Changelog
+
+## v0.28.0
+
+**v0.28.0 significantly changes the interface for this package.** For examples
+of the differences between v0.28.0 and previous versions, see [Migrating to
+the BigQuery Python client library
+v0.28](https://cloud.google.com/bigquery/docs/python-client-migration).
+These changes can be summarized as follows:
+
+-   Query and view operations default to the standard SQL dialect. (#4192)
+-   Client functions related to
+    [jobs](https://cloud.google.com/bigquery/docs/jobs-overview), like running
+    queries, immediately start the job.
+-   Functions to create, get, update, delete datasets and tables moved to the
+    client class.
+
+### Fixes
+
+- Populate timeout parameter correctly for queries (#4209)
+- Automatically retry idempotent RPCs (#4148, #4178)
+- Parse timestamps in query parameters using canonical format (#3945)
+- Parse array parameters that contain a struct type. (#4040)
+- Support Sub Second Datetimes in row data (#3901, #3915, #3926), h/t @page1
+
+### Interface changes / additions
+
+- Support external table configuration (#4182) in query jobs (#4191) and
+  tables (#4193).
+- New `Row` class allows for access by integer index like a tuple, string
+  index like a dictionary, or attribute access like an object. (#4149)
+- Add option for job ID generation with user-supplied prefix (#4198)
+- Add support for update of dataset access entries (#4197)
+- Add support for atomic read-modify-write of a dataset using etag (#4052)
+- Add support for labels to `Dataset` (#4026)
+- Add support for labels to `Table` (#4207)
+- Add `Table.streaming_buffer` property (#4161)
+- Add `TableReference` class (#3942)
+- Add `DatasetReference` class (#3938, #3942, #3993)
+- Add `ExtractJob.destination_uri_file_counts` property. (#3803)
+- Add `client.create_rows_json()` to bypass conversions on streaming writes.
+  (#4189)
+- Add `client.get_job()` to get arbitrary jobs. (#3804, #4213)
+- Add filter to `client.list_datasets()` (#4205)
+- Add `QueryJob.undeclared_query_parameters` property. (#3802)
+- Add `QueryJob.referenced_tables` property. (#3801)
+- Add new scalar statistics properties to `QueryJob` (#3800)
+- Add `QueryJob.query_plan` property. (#3799)
+
+### Interface changes / breaking changes
+
+- Remove `client.run_async_query()`, use `client.query()` instead. (#4130)
+- Remove `client.run_sync_query()`, use `client.query_rows()` instead. (#4065, #4248)
+- Make `QueryResults` read-only. (#4094, #4144)
+- Make `get_query_results` private. Return rows for `QueryJob.result()` (#3883)
+- Move `*QueryParameter` and `UDFResource` classes to `query` module (also
+  exposed in `bigquery` module). (#4156)
+
+#### Changes to tables
+
+- Remove `client` from `Table` class (#4159)
+- Remove `table.exists()` (#4145)
+- Move `table.list_parations` to `client.list_partitions` (#4146)
+- Move `table.upload_from_file` to `client.load_table_from_file` (#4136)
+- Move `table.update()` and `table.patch()` to `client.update_table()` (#4076)
+- Move `table.insert_data()` to `client.create_rows()`. Automatically
+  generates row IDs if not supplied. (#4151, #4173)
+- Move `table.fetch_data()` to `client.list_rows()` (#4119, #4143)
+- Move `table.delete()` to `client.delete_table()` (#4066)
+- Move `table.create()` to `client.create_table()` (#4038, #4043)
+- Move `table.reload()` to `client.get_table()` (#4004)
+- Rename `Table.name` attribute to `Table.table_id` (#3959)
+- `Table` constructor takes a `TableReference` as parameter (#3997)
+
+#### Changes to datasets
+
+- Remove `client` from `Dataset` class (#4018)
+- Remove `dataset.exists()` (#3996)
+- Move `dataset.list_tables()` to `client.list_dataset_tables()` (#4013)
+- Move `dataset.delete()` to `client.delete_dataset()` (#4012)
+- Move `dataset.patch()` and `dataset.update()` to `client.update_dataset()` (#4003)
+- Move `dataset.create()` to `client.create_dataset()` (#3982)
+- Move `dataset.reload()` to `client.get_dataset()` (#3973)
+- Rename `Dataset.name` attribute to `Dataset.dataset_id` (#3955)
+- `client.dataset()` returns a `DatasetReference` instead of `Dataset`. (#3944)
+- Rename class: `dataset.AccessGrant -> dataset.AccessEntry`. (#3798)
+- `dataset.table()` returns a `TableReference` instead of a `Table` (#4014)
+- `Dataset` constructor takes a DatasetReference (#4036)
+
+#### Changes to jobs
+
+- Make `job.begin()` method private. (#4242)
+- Add `LoadJobConfig` class and modify `LoadJob` (#4103, #4137)
+- Add `CopyJobConfig` class and modify `CopyJob` (#4051, #4059)
+- Type of Job's and Query's `default_dataset` changed from `Dataset` to
+  `DatasetReference` (#4037)
+- Rename `client.load_table_from_storage()` to `client.load_table_from_uri()`
+  (#4235)
+- Rename `client.extract_table_to_storage` to `client.extract_table()`.
+  Method starts the extract job immediately. (#3991, #4177)
+- Rename `XJob.name` to `XJob.job_id`. (#3962)
+- Rename job classes. `LoadTableFromStorageJob -> LoadJob` and
+  `ExtractTableToStorageJob -> jobs.ExtractJob` (#3797)
+
+### Dependencies
+
+- Updating to `google-cloud-core ~= 0.28`, in particular, the
+  `google-api-core` package has been moved out of `google-cloud-core`. (#4221)
+
+PyPI: https://pypi.org/project/google-cloud-bigquery/0.28.0/
+
+
+## v0.27.0
+
+- Remove client-side enum validation. (#3735)
+- Add `Table.row_from_mapping` helper. (#3425)
+- Move `google.cloud.future` to `google.api.core` (#3764)
+- Fix `__eq__` and `__ne__`. (#3765)
+- Move `google.cloud.iterator` to `google.api.core.page_iterator` (#3770)
+- `nullMarker` support for BigQuery Load Jobs (#3777), h/t @leondealmeida
+- Allow `job_id` to be explicitly specified in DB-API. (#3779)
+- Add support for a custom null marker. (#3776)
+- Add `SchemaField` serialization and deserialization. (#3786)
+- Add `get_query_results` method to the client. (#3838)
+- Poll for query completion via `getQueryResults` method. (#3844)
+- Allow fetching more than the first page when `max_results` is set. (#3845)
+
+PyPI: https://pypi.org/project/google-cloud-bigquery/0.27.0/
+
+## 0.26.0
+
+### Notable implementation changes
+
+- Using the `requests` transport attached to a Client for for resumable media
+  (i.e. downloads and uploads) (#3705) (this relates to the `httplib2` to
+  `requests` switch)
+
+### Interface changes / additions
+
+- Adding `autodetect` property on `LoadTableFromStorageJob` to enable schema
+  autodetection. (#3648)
+- Implementing the Python Futures interface for Jobs. Call `job.result()` to
+  wait for jobs to complete instead of polling manually on the job status.
+  (#3626)
+- Adding `is_nullable` property on `SchemaField`. Can be used to check if a
+  column is nullable. (#3620)
+- `job_name` argument added to `Table.upload_from_file` for setting the job
+  ID. (#3605)
+- Adding `google.cloud.bigquery.dbapi` package, which implements PEP-249
+  DB-API specification. (#2921)
+- Adding `Table.view_use_legacy_sql` property. Can be used to create views
+  with legacy or standard SQL. (#3514)
+
+### Interface changes / breaking changes
+
+- Removing `results()` method from the `QueryJob` class. Use
+  `query_results()` instead. (#3661)
+- `SchemaField` is now immutable. It is also hashable so that it can be used
+  in sets. (#3601)
+
+### Dependencies
+
+- Updating to `google-cloud-core ~= 0.26`, in particular, the underlying HTTP
+  transport switched from `httplib2` to `requests` (#3654, #3674)
+- Adding dependency on `google-resumable-media` for loading BigQuery tables
+  from local files. (#3555)
+
+### Packaging
+
+- Fix inclusion of `tests` (vs. `unit_tests`) in `MANIFEST.in` (#3552)
+- Updating `author_email` in `setup.py` to `googleapis-publisher@google.com`.
+  (#3598)
+
+PyPI: https://pypi.org/project/google-cloud-bigquery/0.26.0/