Bump to version 4.3.0rc1 (#841)

Signed-off-by: Vikrant Puppala <vikrant.puppala@databricks.com>

Author: vikrantpuppala

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Release History
 
+# 4.3.0rc1 (2026-06-11)
+- 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 (databricks/databricks-sql-python#824, #825, #830, #838, #839 by @vikrantpuppala)
+- Revert the thrift 0.23.0 bump that broke installation on DBR LTS (ES-1960554) (databricks/databricks-sql-python#840 by @vikrantpuppala)
+
 # 4.2.7 (2026-06-02)
 - Extract SPOG org-id from cluster http_path for non-Thrift requests (databricks/databricks-sql-python#817 by @msrathore-db)
 - Remove empty chunks in CloudFetch concatenation (databricks/databricks-sql-python#814 by @jprakash-db)

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "databricks-sql-connector"
-version = "4.2.7"
+version = "4.3.0rc1"
 description = "Databricks SQL Connector for Python"
 authors = ["Databricks <databricks-sql-connector-maintainers@databricks.com>"]
 license = "Apache-2.0"

src/databricks/sql/__init__.py

@@ -71,7 +71,7 @@ def __repr__(self):
 DATE = DBAPITypeObject("date")
 ROWID = DBAPITypeObject()
 
-__version__ = "4.2.7"
+__version__ = "4.3.0rc1"
 USER_AGENT_NAME = "PyDatabricksSqlConnector"
 
 # These two functions are pyhive legacy