v4.3.0

• New: optional Rust kernel backend (use_kernel=True). Adds an alternative connection path backed by the native databricks-sql-kernel client (a Rust core exposed via PyO3), installable with the new databricks-sql-connector[kernel] extra. The kernel talks to Databricks over the SEA (Statement Execution API) HTTP transport — not Thrift — with CloudFetch and inline-Arrow result fetching, so use_kernel=True gives you a modern SEA-native client through the same DB-API surface. Supports PAT, OAuth M2M, and OAuth U2M auth. Requires Python >= 3.10 (the kernel wheel is cp310-abi3); on older interpreters the extra is a no-op and use_kernel=True raises a clear ImportError. The default backend remains Thrift — opt in per connection.
• Kernel backend behavior is aligned with the Thrift backend so application code works the same either way: consistent cursor-state tracking (query_id / get_query_state), metadata (catalogs/schemas/tables/columns with JDBC-style filter semantics and case-insensitive table_types), DML rowcount, server-sourced async execution state, sync cancel(), fail-loud staging/volume operations, and structured error context (SQLSTATE, diagnostic info). Kernel logs surface through Python logging under the databricks.sql.kernel logger (#824, #825, #830, #838, #839 by @vikrantpuppala)
• Revert the thrift 0.23.0 bump that broke installation on DBR LTS (ES-1960554) (#840 by @vikrantpuppala)

v4.3.0rc1

• Add optional Rust kernel backend for use_kernel=True, installable via the new databricks-sql-connector[kernel] extra (requires Python >= 3.10). Routes connections through the native databricks-sql-kernel client, with parity work across cursor-state tracking, metadata, logging (kernel logs surface through Python logging), staging fail-loud behavior, error context, and sync cancel (#824, #825, #830, #838, #839 by @vikrantpuppala)
• Revert the thrift 0.23.0 bump that broke installation on DBR LTS (ES-1960554) (#840 by @vikrantpuppala)

v4.2.7

• Extract SPOG org-id from cluster http_path for non-Thrift requests (#817 by @msrathore-db)
• Remove empty chunks in CloudFetch concatenation (#814 by @jprakash-db)
• Add _retry_server_directed_only mode for Retry-After header compliance (#756 by @sd-db)
• Bump thrift to 0.23.0 (#796 by @leoromanovsky)
• Allow pandas 3.x in dependency constraints (#768 by @moomindani)
• Telemetry: unwrap TokenFederationProvider to report inner auth mechanism/flow (#781 by @samikshya-db)

v4.2.6

• Add SPOG routing support for account-level vanity URLs (#767 by @msrathore-db)
• Fix dependency_manager: handle PEP 440 ~= compatible release syntax (#776 by @vikrantpuppala)
• Bump thrift to fix deprecation warning (#733 by @Korijn)
• Add AI coding agent detection to User-Agent header (#740 by @vikrantpuppala)
• Add statement-level query_tags support for SEA backend (#754 by @sreekanth-db)
• Update PyArrow concatenation of tables to use promote_options as default (#751 by @jprakash-db)
• Fix float inference to use DoubleParameter (64-bit) instead of FloatParameter (#742 by @Shubhambhusate)
• Allow specifying query_tags as a dict upon connection creation (#749 by @jiabin-hu)
• Add query_tags parameter support for execute methods (#736 by @jiabin-hu)

v4.1.5

Whats changed

• Add _retry_server_directed_only mode for Retry-After header compliance (#757 by @sd-db)

Full Changelog: v4.1.0...v4.1.5

v3.7.5

Whats changed

• Fix: Pyarrow concat to now merge with promote options as default (#745 by @jprakash-db)

Full Changelog: v3.6.0...v3.7.5

v4.2.5

• Fix feature-flag endpoint retries in gov region (#735 by @samikshya-db)
• Improve telemetry lifecycle management (#734 by @msrathore-db)

v4.2.4

What's Changed

• Fixed the exception handler close() on _TelemetryClientHolder by @msrathore-db in #723
• created util method to normalise http protocol in http path by @nikhilsuri-db in #724

Full Changelog: v4.2.3...v4.2.4

v4.2.3

What's Changed

• added pandas < 2.4.0 support and tests for py 3.14 by @sreekanth-db in #720
• pandas 2.3.3 support for py < 3.14 by @sreekanth-db in #721

Full Changelog: v4.2.2...v4.2.3

v4.2.2

What's Changed

• Change default use_hybrid_disposition to False by @samikshya-db in #714
• Circuit breaker changes using pybreaker by @nikhilsuri-db in #705
• perf: Optimize telemetry latency logging to reduce overhead by @samikshya-db in #715
• basic e2e test for force telemetry verification by @nikhilsuri-db in #708
• feat: Implement host-level telemetry batching to reduce rate limiting by @samikshya-db in #718
• Prepare for a release with telemetry on by default by @samikshya-db in #717

Full Changelog: v4.2.1...v4.2.2