snowflake-connector-python v5.0.0rc1

Snowflake Connector for Python — Release Notes

Features

• Added an asyncio API under snowflake.connector.aio for non-blocking connect,
  execute, fetch, and concurrent queries on a single thread.
• Added typed ConnectionConfig, generated from the shared parameter registry,
  passable via connect(config=...) or built automatically from kwargs.
• Moved networking, authentication, query execution, result fetching, and
  PUT/GET into a shared Rust core (sf_core) used across universal-driver
  bindings.

Breaking Changes

• Closed cursors raise InterfaceError (errno=252006) on all operations;
  previously only execute() was guarded and other methods failed with
  TypeError / AttributeError.
• Fetching or iterating a cursor before any execute raises ProgrammingError
  (errno=252009) instead of TypeError.
• Removed the public Connection.connect() method; the session is established
  at construction time—create a new connection to reconnect.
• Removed the region connection parameter and Connection.region; use a
  fully qualified account or set host explicitly.
• Deprecated client_fetch_threads (alias of client_prefetch_threads);
  client_fetch_use_mp is accepted but has no effect (always a thread pool).
• Made client_session_keep_alive and
  client_session_keep_alive_heartbeat_frequency read-only; assignment raises
  AttributeError—set them at connection time.
• Ignored oauth_enable_refresh_tokens (deprecated no-op); refresh tokens are
  always used when the IdP returns one—gate disk caching with
  client_store_temporary_credential.
• Renamed enable_stage_s3_privatelink_for_us_east_1 to use_s3_regional_url
  (old name remains a deprecated alias).
• Stopped reading HTTP_PROXY / HTTPS_PROXY / NO_PROXY by default; set
  use_proxy_env=True (or PROXYWITHENV=true) to opt in. Explicit proxy
  params win over env vars.
• Stopped raising ReauthenticationRequest on master-token expiry (Snowpark
  reauth signal not yet wired).
• Stopped forcing a hardcoded amazonaws.com.cn S3 endpoint for cn-*
  regions; the AWS SDK resolver is used unless an explicit or regional-URL
  override is set.
• Stopped setting Content-Encoding: utf-8 on Azure Blob PUT (matches JDBC /
  libsnowflakeclient).
• Stopped embedding the original filename in the gzip header for compressed
  uploads.