Introduce Backend Interface (DatabricksClient) #573

varun-edachali-dbx · 2025-05-26T09:10:46Z

What type of PR is this?

Refactor

Description

Introduce the DatabricksClient interface and make the existing thrift backend implement it. This allows the cursor to not be aware of the type of backend instantiated. Currently, we have to include some assertions in the ResultSet to ensure we have a ThriftDatabricksClient type, because the fetch-phase abstractions have not been implemented yet.
Introduce SessionId and CommandId interfaces to create a consistent adapter to be used to represent sessions and commands instead of relying on Thrift (or eventually, SEA) specific types.

How is this tested?

Unit tests
- some of the existing unit tests were slightly altered to account for the introduction of the interface. No unit tests were removed or introduced.
E2E Tests
Manually
N/A

Related Tickets & Documents

https://docs.google.com/document/d/1Y-eXLhNqqhrMVGnOlG8sdFrCxBTN1GdQvuKG4IfHmo0/edit?usp=sharing
https://databricks.atlassian.net/browse/PECOBLR-440?atlOrigin=eyJpIjoiMTgzNGNiMDVkMGQ3NDM2Njg5OTRhZWQ1MGQ4Mjg1OWIiLCJwIjoiaiJ9

github-actions · 2025-05-26T09:14:37Z

Thanks for your contribution! To satisfy the DCO policy in our contributing guide every commit message must include a sign-off message. One or more of your commits is missing this message. You can reword previous commit messages with an interactive rebase (git rebase -i main).

github-actions · 2025-05-26T10:33:57Z

Thanks for your contribution! To satisfy the DCO policy in our contributing guide every commit message must include a sign-off message. One or more of your commits is missing this message. You can reword previous commit messages with an interactive rebase (git rebase -i main).

github-actions · 2025-05-26T12:53:36Z

Thanks for your contribution! To satisfy the DCO policy in our contributing guide every commit message must include a sign-off message. One or more of your commits is missing this message. You can reword previous commit messages with an interactive rebase (git rebase -i main).

Signed-off-by: varun-edachali-dbx <[email protected]>

src/databricks/sql/backend/databricks_client.py

Signed-off-by: varun-edachali-dbx <[email protected]>

jayantsing-db

Thanks for changes and most importantly changes to tests. Some minor nit comments, rest LGTM

src/databricks/sql/backend/databricks_client.py

src/databricks/sql/backend/utils/guid_utils.py

src/databricks/sql/client.py

tests/unit/test_client.py

tests/unit/test_parameters.py

tests/unit/test_thrift_backend.py

jayantsing-db · 2025-05-30T12:45:11Z

please make a note of the failing integration test in commit message when pushing if it is unrelated to these changes.

Signed-off-by: varun-edachali-dbx <[email protected]>

samikshya-db · 2025-05-30T16:33:02Z

In the future, let's try to raise smaller size PRs typically within 700 lines of code changes including tests. This will help you get more reviews and more importantly more thorough reviews. Thanks.

jayantsing-db · 2025-05-30T16:36:06Z

In the future, let's try to raise smaller size PRs typically within 700 lines of code changes including tests. This will help you get more reviews and more importantly more thorough reviews. Thanks.

Hey @samikshya-db, it's tricky to further scope this down. Otherwise, it was adding too much overhead.

samikshya-db · 2025-05-30T16:42:40Z

@jayantsing-db I understand this would be harder for the initial set of SEA PRs. Even then, it is good to keep this in mind and try to break it down. Happy to brainstorm on this too.

jayantsing-db · 2025-05-30T16:46:56Z

Even then, it is good to keep this in mind and try to break it down. Happy to brainstorm on this too.

yes

I understand this would be harder for the initial set of SEA PRs

heads up, this and couple more are refactoring PRs to prepare for SEA changes. refactoring PRs are usually high in LOC because we have to make sure current set of tests do not break and so the related changes have to go in together. Even then @varun-edachali-dbx first session re-factoring PR is ~500

for SEA PR, LOC will be low as expected per PR.

NOTE: the `test_complex_types` e2e test was not working at the time of this merge. The test must be triggered when the test is back up and running as intended. * remove excess logs, assertions, instantiations large merge artifacts Signed-off-by: varun-edachali-dbx <[email protected]> * formatting (black) + remove excess log (merge artifact) Signed-off-by: varun-edachali-dbx <[email protected]> * fix typing Signed-off-by: varun-edachali-dbx <[email protected]> * remove un-necessary check Signed-off-by: varun-edachali-dbx <[email protected]> * remove un-necessary replace call Signed-off-by: varun-edachali-dbx <[email protected]> * introduce __str__ methods for CommandId and SessionId Signed-off-by: varun-edachali-dbx <[email protected]> * docstrings for DatabricksClient interface Signed-off-by: varun-edachali-dbx <[email protected]> * stronger typing of Cursor and ExecuteResponse Signed-off-by: varun-edachali-dbx <[email protected]> * remove utility functions from backend interface, fix circular import Signed-off-by: varun-edachali-dbx <[email protected]> * rename info to properties Signed-off-by: varun-edachali-dbx <[email protected]> * newline for cleanliness Signed-off-by: varun-edachali-dbx <[email protected]> * fix circular import Signed-off-by: varun-edachali-dbx <[email protected]> * formatting (black) Signed-off-by: varun-edachali-dbx <[email protected]> * to_hex_id -> get_hex_id Signed-off-by: varun-edachali-dbx <[email protected]> * better comment on protocol version getter Signed-off-by: varun-edachali-dbx <[email protected]> * formatting (black) Signed-off-by: varun-edachali-dbx <[email protected]> * move guid to hex id to new utils module Signed-off-by: varun-edachali-dbx <[email protected]> * formatting (black) Signed-off-by: varun-edachali-dbx <[email protected]> * move staging allowed local path to connection props Signed-off-by: varun-edachali-dbx <[email protected]> * add strong return type for execute_command Signed-off-by: varun-edachali-dbx <[email protected]> * skip auth, error handling in databricksclient interface Signed-off-by: varun-edachali-dbx <[email protected]> * chore: docstring + line width Signed-off-by: varun-edachali-dbx <[email protected]> * get_id -> get_guid Signed-off-by: varun-edachali-dbx <[email protected]> * chore: docstring Signed-off-by: varun-edachali-dbx <[email protected]> * fix: to_hex_id -> to_hex_guid Signed-off-by: varun-edachali-dbx <[email protected]> --------- Signed-off-by: varun-edachali-dbx <[email protected]>

* Separate Session related functionality from Connection class (#571) * decouple session class from existing Connection ensure maintenance of current APIs of Connection while delegating responsibility Signed-off-by: varun-edachali-dbx <[email protected]> * add open property to Connection to ensure maintenance of existing API Signed-off-by: varun-edachali-dbx <[email protected]> * update unit tests to address ThriftBackend through session instead of through Connection Signed-off-by: varun-edachali-dbx <[email protected]> * chore: move session specific tests from test_client to test_session Signed-off-by: varun-edachali-dbx <[email protected]> * formatting (black) as in CONTRIBUTING.md Signed-off-by: varun-edachali-dbx <[email protected]> * use connection open property instead of long chain through session Signed-off-by: varun-edachali-dbx <[email protected]> * trigger integration workflow Signed-off-by: varun-edachali-dbx <[email protected]> * fix: ensure open attribute of Connection never fails in case the openSession takes long, the initialisation of the session will not complete immediately. This could make the session attribute inaccessible. If the Connection is deleted in this time, the open() check will throw because the session attribute does not exist. Thus, we default to the Connection being closed in this case. This was not an issue before because open was a direct attribute of the Connection class. Caught in the integration tests. Signed-off-by: varun-edachali-dbx <[email protected]> * fix: de-complicate earlier connection open logic earlier, one of the integration tests was failing because 'session was not an attribute of Connection'. This is likely tied to a local configuration issue related to unittest that was causing an error in the test suite itself. The tests are now passing without checking for the session attribute. c676f9b Signed-off-by: varun-edachali-dbx <[email protected]> * Revert "fix: de-complicate earlier connection open logic" This reverts commit d6b1b19. Signed-off-by: varun-edachali-dbx <[email protected]> * [empty commit] attempt to trigger ci e2e workflow Signed-off-by: varun-edachali-dbx <[email protected]> * Update CODEOWNERS (#562) new codeowners Signed-off-by: varun-edachali-dbx <[email protected]> * Enhance Cursor close handling and context manager exception management to prevent server side resource leaks (#554) * Enhance Cursor close handling and context manager exception management * tests * fmt * Fix Cursor.close() to properly handle CursorAlreadyClosedError * Remove specific test message from Cursor.close() error handling * Improve error handling in connection and cursor context managers to ensure proper closure during exceptions, including KeyboardInterrupt. Add tests for nested cursor management and verify operation closure on server-side errors. * add * add Signed-off-by: varun-edachali-dbx <[email protected]> * PECOBLR-86 improve logging on python driver (#556) * PECOBLR-86 Improve logging for debug level Signed-off-by: Sai Shree Pradhan <[email protected]> * PECOBLR-86 Improve logging for debug level Signed-off-by: Sai Shree Pradhan <[email protected]> * fixed format Signed-off-by: Sai Shree Pradhan <[email protected]> * used lazy logging Signed-off-by: Sai Shree Pradhan <[email protected]> * changed debug to error logs Signed-off-by: Sai Shree Pradhan <[email protected]> * used lazy logging Signed-off-by: Sai Shree Pradhan <[email protected]> --------- Signed-off-by: Sai Shree Pradhan <[email protected]> Signed-off-by: varun-edachali-dbx <[email protected]> * Revert "Merge remote-tracking branch 'upstream/sea-migration' into decouple-session" This reverts commit dbb2ec5, reversing changes made to 7192f11. Signed-off-by: varun-edachali-dbx <[email protected]> * Reapply "Merge remote-tracking branch 'upstream/sea-migration' into decouple-session" This reverts commit bdb8381. Signed-off-by: varun-edachali-dbx <[email protected]> * fix: separate session opening logic from instantiation ensures correctness of self.session.open call in Connection Signed-off-by: varun-edachali-dbx <[email protected]> * fix: use is_open attribute to denote session availability Signed-off-by: varun-edachali-dbx <[email protected]> * fix: access thrift backend through session Signed-off-by: varun-edachali-dbx <[email protected]> * chore: use get_handle() instead of private session attribute in client Signed-off-by: varun-edachali-dbx <[email protected]> * formatting (black) Signed-off-by: varun-edachali-dbx <[email protected]> * fix: remove accidentally removed assertions Signed-off-by: varun-edachali-dbx <[email protected]> --------- Signed-off-by: varun-edachali-dbx <[email protected]> Signed-off-by: Sai Shree Pradhan <[email protected]> Co-authored-by: Jothi Prakash <[email protected]> Co-authored-by: Madhav Sainanee <[email protected]> Co-authored-by: Sai Shree Pradhan <[email protected]> * Introduce Backend Interface (DatabricksClient) (#573) NOTE: the `test_complex_types` e2e test was not working at the time of this merge. The test must be triggered when the test is back up and running as intended. * remove excess logs, assertions, instantiations large merge artifacts Signed-off-by: varun-edachali-dbx <[email protected]> * formatting (black) + remove excess log (merge artifact) Signed-off-by: varun-edachali-dbx <[email protected]> * fix typing Signed-off-by: varun-edachali-dbx <[email protected]> * remove un-necessary check Signed-off-by: varun-edachali-dbx <[email protected]> * remove un-necessary replace call Signed-off-by: varun-edachali-dbx <[email protected]> * introduce __str__ methods for CommandId and SessionId Signed-off-by: varun-edachali-dbx <[email protected]> * docstrings for DatabricksClient interface Signed-off-by: varun-edachali-dbx <[email protected]> * stronger typing of Cursor and ExecuteResponse Signed-off-by: varun-edachali-dbx <[email protected]> * remove utility functions from backend interface, fix circular import Signed-off-by: varun-edachali-dbx <[email protected]> * rename info to properties Signed-off-by: varun-edachali-dbx <[email protected]> * newline for cleanliness Signed-off-by: varun-edachali-dbx <[email protected]> * fix circular import Signed-off-by: varun-edachali-dbx <[email protected]> * formatting (black) Signed-off-by: varun-edachali-dbx <[email protected]> * to_hex_id -> get_hex_id Signed-off-by: varun-edachali-dbx <[email protected]> * better comment on protocol version getter Signed-off-by: varun-edachali-dbx <[email protected]> * formatting (black) Signed-off-by: varun-edachali-dbx <[email protected]> * move guid to hex id to new utils module Signed-off-by: varun-edachali-dbx <[email protected]> * formatting (black) Signed-off-by: varun-edachali-dbx <[email protected]> * move staging allowed local path to connection props Signed-off-by: varun-edachali-dbx <[email protected]> * add strong return type for execute_command Signed-off-by: varun-edachali-dbx <[email protected]> * skip auth, error handling in databricksclient interface Signed-off-by: varun-edachali-dbx <[email protected]> * chore: docstring + line width Signed-off-by: varun-edachali-dbx <[email protected]> * get_id -> get_guid Signed-off-by: varun-edachali-dbx <[email protected]> * chore: docstring Signed-off-by: varun-edachali-dbx <[email protected]> * fix: to_hex_id -> to_hex_guid Signed-off-by: varun-edachali-dbx <[email protected]> --------- Signed-off-by: varun-edachali-dbx <[email protected]> * Implement ResultSet Abstraction (backend interfaces for fetch phase) (#574) * ensure backend client returns a ResultSet type in backend tests Signed-off-by: varun-edachali-dbx <[email protected]> * formatting (black) Signed-off-by: varun-edachali-dbx <[email protected]> * newline for cleanliness Signed-off-by: varun-edachali-dbx <[email protected]> * fix circular import Signed-off-by: varun-edachali-dbx <[email protected]> * formatting (black) Signed-off-by: varun-edachali-dbx <[email protected]> * to_hex_id -> get_hex_id Signed-off-by: varun-edachali-dbx <[email protected]> * better comment on protocol version getter Signed-off-by: varun-edachali-dbx <[email protected]> * formatting (black) Signed-off-by: varun-edachali-dbx <[email protected]> * stricter typing for cursor Signed-off-by: varun-edachali-dbx <[email protected]> * correct typing Signed-off-by: varun-edachali-dbx <[email protected]> * correct tests and merge artifacts Signed-off-by: varun-edachali-dbx <[email protected]> * remove accidentally modified workflow files remnants of old merge Signed-off-by: varun-edachali-dbx <[email protected]> * chore: remove accidentally modified workflow files Signed-off-by: varun-edachali-dbx <[email protected]> * add back accidentally removed docstrings Signed-off-by: varun-edachali-dbx <[email protected]> * clean up docstrings Signed-off-by: varun-edachali-dbx <[email protected]> * log hex Signed-off-by: varun-edachali-dbx <[email protected]> * remove unnecessary _replace call Signed-off-by: varun-edachali-dbx <[email protected]> * add __str__ for CommandId Signed-off-by: varun-edachali-dbx <[email protected]> * take TOpenSessionResp in get_protocol_version to maintain existing interface Signed-off-by: varun-edachali-dbx <[email protected]> * active_op_handle -> active_mmand_id Signed-off-by: varun-edachali-dbx <[email protected]> * ensure None returned for close_command Signed-off-by: varun-edachali-dbx <[email protected]> * account for ResultSet return in new pydocs Signed-off-by: varun-edachali-dbx <[email protected]> * pydoc for types Signed-off-by: varun-edachali-dbx <[email protected]> * move common state to ResultSet aprent Signed-off-by: varun-edachali-dbx <[email protected]> * stronger typing in resultSet behaviour Signed-off-by: varun-edachali-dbx <[email protected]> * remove redundant patch in test Signed-off-by: varun-edachali-dbx <[email protected]> * add has_been_closed_server_side assertion Signed-off-by: varun-edachali-dbx <[email protected]> * remove redundancies in tests Signed-off-by: varun-edachali-dbx <[email protected]> * more robust close check Signed-off-by: varun-edachali-dbx <[email protected]> * use normalised state in e2e test Signed-off-by: varun-edachali-dbx <[email protected]> * simplify corrected test Signed-off-by: varun-edachali-dbx <[email protected]> * add line gaps after multi-line pydocs for consistency Signed-off-by: varun-edachali-dbx <[email protected]> * use normalised CommandState type in ExecuteResponse Signed-off-by: varun-edachali-dbx <[email protected]> --------- Signed-off-by: varun-edachali-dbx <[email protected]> * remove un-necessary initialisation assertions Signed-off-by: varun-edachali-dbx <[email protected]> * remove un-necessary line break s Signed-off-by: varun-edachali-dbx <[email protected]> * more un-necessary line breaks Signed-off-by: varun-edachali-dbx <[email protected]> * constrain diff of test_closing_connection_closes_commands Signed-off-by: varun-edachali-dbx <[email protected]> * reduce diff of test_closing_connection_closes_commands Signed-off-by: varun-edachali-dbx <[email protected]> * use pytest-like assertions for test_closing_connection_closes_commands Signed-off-by: varun-edachali-dbx <[email protected]> * ensure command_id is not None Signed-off-by: varun-edachali-dbx <[email protected]> * line breaks after multi-line pyfocs Signed-off-by: varun-edachali-dbx <[email protected]> * ensure non null operationHandle for commandId creation Signed-off-by: varun-edachali-dbx <[email protected]> * use command_id methods instead of explicit guid_to_hex_id conversion Signed-off-by: varun-edachali-dbx <[email protected]> * remove un-necessary artifacts in test_session, add back assertion Signed-off-by: varun-edachali-dbx <[email protected]> * add from __future__ import annotations to remove string literals around forward refs, remove some unused imports Signed-off-by: varun-edachali-dbx <[email protected]> * move docstring of DatabricksClient within class Signed-off-by: varun-edachali-dbx <[email protected]> * move ThriftResultSet import to top of file Signed-off-by: varun-edachali-dbx <[email protected]> * make backend/utils __init__ file empty Signed-off-by: varun-edachali-dbx <[email protected]> * use from __future__ import annotations to remove string literals around Cursor Signed-off-by: varun-edachali-dbx <[email protected]> * use lazy logging Signed-off-by: varun-edachali-dbx <[email protected]> * replace getters with property tag Signed-off-by: varun-edachali-dbx <[email protected]> * set active_command_id to None, not active_op_handle Signed-off-by: varun-edachali-dbx <[email protected]> * align test_session with pytest instead of unittest Signed-off-by: varun-edachali-dbx <[email protected]> * formatting (black) Signed-off-by: varun-edachali-dbx <[email protected]> * remove repetition from Session.__init__ Signed-off-by: varun-edachali-dbx <[email protected]> * mention that if catalog / schema name is None, we fetch across all Signed-off-by: varun-edachali-dbx <[email protected]> * mention fetching across all tables if null table name Signed-off-by: varun-edachali-dbx <[email protected]> * remove lazy import of ThriftResultSet Signed-off-by: varun-edachali-dbx <[email protected]> * remove unused import Signed-off-by: varun-edachali-dbx <[email protected]> * better docstrings Signed-off-by: varun-edachali-dbx <[email protected]> * clarified role of cursor in docstring Signed-off-by: varun-edachali-dbx <[email protected]> --------- Signed-off-by: varun-edachali-dbx <[email protected]>

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formatting (black)

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move guid to hex id to new utils module

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formatting (black)

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move staging allowed local path to connection props

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varun-edachali-dbx added 5 commits May 30, 2025 16:02

add strong return type for execute_command

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skip auth, error handling in databricksclient interface

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chore: docstring + line width

54077f7

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get_id -> get_guid

91357f4

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chore: docstring

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fix: to_hex_id -> to_hex_guid

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varun-edachali-dbx merged commit 400a8bd into sea-migration May 30, 2025
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varun-edachali-dbx mentioned this pull request Jun 18, 2025

Generalise Backend Layer #604

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Introduce Backend Interface (DatabricksClient) #573

Introduce Backend Interface (DatabricksClient) #573

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