Snowflake Connector for Python release notes for 2023

This article contains the release notes for the Snowflake Connector for Python, including the following when applicable:

  • Behavior changes

  • New features

  • Customer-facing bug fixes

Snowflake uses semantic versioning for Snowflake Connector for Python updates.

Version 3.2.1 (October 3, 2023)

New features and updates

  • Added thread safety in telemetry when instantiating multiple connections concurrently.

  • Improved robustness in handling authentication changes.

  • Removed the urllib3.contrib.pyopenssl deprecation warning from urllib3 library.

  • Updated the platformdirs dependency to versions 2.6.0 through 4.0.0 from versions 2.6.0 through 3.9.0.

Bug fixes

  • Fixed a bug where URL, port, and path were ignored in AWS PrivateLink OCSP retry attempts.

Version 3.2.0 (September 7, 2023)

New features and updates

  • Made the parser -> manager renaming more consistent in snowflake.connector.config_manager module.

  • Added support for default values for ConfigOptions.

  • Added default_connection_name to config.toml file.

Bug fixes

  • None.

Version 3.1.1 (August 28, 2023)

New features and updates

  • Added support for RSAPublicKey when constructing AuthByKeyPair in addition to raw bytes.

Bug fixes

  • Fixed a bug in retry logic for OKTA authentication to refresh token.

  • Fixed a bug where the attribute proxy_header is missing in SOCKSProxyManager when connecting through SOCKS5 proxy.

Version 3.1.0 (July 31, 2023)

New features and updates

  • Added a feature that lets you add connection definitions to the connections.toml configuration file. A connection definition refers to a collection of connection parameters, for example, if you wanted to define a connection named “prod”:

    [prod]
account = "my_account"
user = "my_user"
password = "my_password"
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    By default, we look for the connections.toml file in the location specified in the SNOWFLAKE_HOME environment variable (default: ~/.snowflake). If this folder does not exist, the Python connector looks for the file in the platformdirs location, as follows:

    • On Linux: ~/.config/snowflake/, but follows XDG settings

    • On Mac: ~/Library/Application Support/snowflake/

    • On Windows: %USERPROFILE%\AppData\Local\snowflake\

    You can determine which file is used by running the following command:

    python -c "from snowflake.connector.constants import CONNECTIONS_FILE; print(str(CONNECTIONS_FILE))"
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  • Bumped cryptography dependency from <41.0.0,>=3.1.0 to >=3.1.0,<42.0.0.

  • Improved OCSP response caching to remove tmp cache files on Windows

  • Improved OCSP response caching to reduce the times of disk writing.

  • Added a parameter server_session_keep_alive in SnowflakeConnection that skips session deletion when client connection closes.

  • Tightened our pinning of platformdirs, to prevent their new releases breaking new versions of the connector.

  • Allowed you to pass type_mapper to fetch_pandas_batches() and fetch_pandas_all().

  • Improved retry logic for okta authentication to refresh token if authentication gets throttled.

  • Added retry reasons for queries that are retried by the client.

  • Remove Python 3.7 support.

  • Improved error handling of connection reset error.

Bug fixes

  • Fixed a bug where SFPlatformDirs would incorrectly append application_name/version to its path.

  • Fixed a bug where write_pandas fails when user does not have the privilege to create stage or file format in the target schema, but has the right privilege for the current schema.

  • Worked around a segfault which sometimes occurred during cache serialization in multi-threaded scenarios.

  • Fixed a bug about deleting the temporary files happened when running PUT command.

  • Fixed a bug where pickle.dump segfaults during cache serialization in multi-threaded scenarios.

Version 3.0.4 (May 25, 2023)

New features and updates

  • Added the json_result_force_utf8_decoding connection parameter to force decoding JSON content in utf-8 when the result format is JSON.

  • Bumped vendored library urllib3 to 1.26.15

  • Bumped vendored library requests to 2.29.0

  • Bumped pandas dependency from <1.6.0,>=1.0.0 to >=1.0.0,<2.1.0

  • Add support for Geometry types.

Bug fixes

  • Fixed a bug in which cursor.execute() could modify the argument statement_params dictionary object when executing a multi-statement query.

  • Fixed a bug prevented calling SnowflakeCursor.nextset before fetching the result of the first query if the cursor runs an async multi-statement query.

  • Fixed a bug when _prefetch_hook() was not called before yielding results of execute_async().

  • Fixed a bug where some ResultMetadata fields were marked as required when they were optional.

  • Fixed a bug where bulk insert converts date incorrectly.

Version 3.0.3 (April 20, 2023)

New features and updates

  • Added a parameter that allows users to skip file uploads to stage if file exists on stage and contents of the file match.

  • Improved type hint of SnowflakeCursor.execute method.

  • Improved GET logging to warn when downloading multiple files with the same name.

Bug fixes

  • Fixed a bug that prints error in logs for GET command on GCS.

  • Added a parameter that allows users to skip file uploads to stage if file exists on stage and contents of the file match.

  • Fixed a bug that occurred when writing a Pandas DataFrame with column names containing double quotes in snowflake.connector.pandas_tool.write_pandas.

  • Fixed a bug that occurred when writing a Pandas DataFrame with binary data in snowflake.connector.pandas_tool.write_pandas.

Version 3.0.2 (March 23, 2023)

New features and updates

  • None.

Bug fixes

  • Fixed a bug of incorrect type hints of SnowflakeCursor.fetch_arrow_all and SnowflakeCursor.fetchall.

  • Improved logging to mask tokens in case of errors.

  • Fixed a bug where snowflake.connector.util_text.split_statements swallowed the final line break in the case when there are no space between lines.

  • Fixed a memory leak in the logging module of the Cython extension.

  • Fixed a bug where the put command on AWS raised an AttributeError when uploading a file composed of multiple parts.

  • Fixed a bug where the put command on AWS raised an AttributeError for file sizes larger than 200MB.

Version 3.0.1 (March 01, 2023)

New features and updates

  • Improved the robustness of OCSP response caching to handle errors in cases of serialization and deserialization.

  • Replaced the dependency on setuptools in favor of packaging.

  • Updated async_executes method’s doc-string.

  • Errors raised now have a query field that contains the SQL query that caused them when available.

Bug fixes

  • Fixed a bug where AuthByKeyPair.handle_timeout should pass keyword arguments instead of positional arguments when calling AuthByKeyPair.prepare.

  • Fixed a bug where MFA token caching would refuse to work until restarted instead of re-authenticating.

Version 3.0.0 (January 27, 2023)

BCR (Behavior Change Release) change

  • Fixed a bug where write_pandas did not use user-specified schemas and databases to create intermediate objects.

    Previously, the write_pandas function created temporary objects in the currently-used database and schema and only put the final table (that was created or appended) in the user-specified database and schema. With this version, if the database or schema parameters for write_pandas are different than the currently-selected one, you need to make sure that the user who is executing write_pandas has access to create/drop temporary stages, file formats, and tables with the schema referenced by the write_pandas function.

    Snowflake recommends that you test any new driver version in pre-production environments before deploying to production environments. With this behavior change, you should give special attention to the scenario(s) listed above (i.e. write_pandas with database or schemas parameters that differ from the current context).

New features and updates

  • Bumped pyarrow dependency from >=8.0.0,<8.1.0 to >=10.0.1,<10.1.0

  • Bumped pyOpenSSL dependency from <23.0.0 to <24.0.0

  • During browser-based authentication, the SSO url is now printed before opening it in the browser

  • Increased the level of a log for when ArrowResult cannot be imported

  • Added a minimum MacOS version check when compiling C-extensions

Bug fixes

  • Fixed a bug where write_pandas did not use user-specified schema and database to create intermediate objects

  • Fixed a bug where HTTP response code of 429 were not retried

  • Fixed a bug where MFA token caching was not working

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