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History of changes and releases

Release dates, binaries, and other information for the Trino Python client are available in the tags list, the README and the PyPI page.

Release 0.330.0

  • Add support for try_cast to SQLAlchemy dialect. (#473)
  • Add retries on HTTP 429 error from Trino or a gateway/proxy using the Retry-After HTTP header in the response. (#457)
  • Fix token caching for long tokens on Windows. (#477)
  • Fix parsing of multi-valued WWW-Authenticate HTTP headers. (#484)
  • Fix SQLAlchemy get_indexes implementation to return partition column names for Hive connector instead of returning column names of the <table>$partitions table. (#476)
  • Fix parsing of cert and key from SQLAlchemy connection URI. (#478)

Release 0.329.0

  • Add support for SET SESSION AUTHORIZATION. (#349)
  • Add support for GSSAPI based Kerberos authentication. Use auth=GSSAPIAuthentication(...) to use it. (#454)
  • Add support to SQLAlchemy dialect for ROW and ARRAY DDL generation. (#458)
  • Fix possible OAuth2 authentication failures when identity providers return multiple challenges. (#444)

Release 0.328.0

  • Add support for Python 3.12 and drop support for Python 3.7 and PyPy 3.8 which are end-of-life. (#438)
  • Add support for JSON data type to SQLAlchemy dialect. (#387)
  • Add support for IGNORE NULLS in window functions when using SQLAlchemy. (#429)
  • Add support for MAP type to SQLAlchemy dialect. (#397)
  • Add support for per-user OAuth2 token cache if the user is provided when creating the connection. If user is not provided the previous behaviour of a per-host token cache is used. (#430)
  • Add support to configure log level for all modules via the root logger. The root logger is named trino. (#434)
  • Allow using keyring.backends.null.Keyring to disable keyring when using OAuth2. (#431)
  • Fix fetchall returning already returned rows if called after fetchone or fetchmany. (#414)
  • Fix possible failures when retrieving query results if the server returns empty data. (#443)
  • Fix error when closing a cursor without executing a query. (#428)
  • Fix get_indexes in SQLAlchemy to not fail when called for non-Hive tables. (#426)
  • Fix reading and writing MAP types with boolean or integer keys. (#441)
  • Fix incompatibility when using trino-python-client with Ray. (#420)

Release 0.327.0

  • Implement get_catalog_names for SQLAlchemy to get the list of catalogs present on the cluster. (#401)
  • Use OAuth2Authentication if externalAuthentication parameter is set on the connection url when using SQLAlchemy. (#343)
  • Set the User-Agent HTTP header in all requests to Trino Python Client/<client_version>. (#411)
  • Raise TrinoConnectionError for all connection related errors. (#364)

Release 0.326.0

  • Fix SQLAlchemy URL failing to parse if legacy_prepared_statements parameter was specified. (#380)
  • Fix more than required EXECUTE IMMEDIATE queries being executed when legacy_prepared_statements parameter wasn't explicitly set. (#380)

Release 0.325.0

  • Queries with parameters now uses EXECUTE IMMEDIATE instead of PREPARE, EXECUTE and DEALLOCATE if the server supports EXECUTE IMMEDIATE. If EXECUTE IMMEDIATE is not support the client falls back to using PREPARE, EXECUTE and DEALLOCATE. If you want to always use PREPARE, EXECUTE and DEALLOCATE set the kwarg legacy_prepared_statements to True. (#375)

Release 0.324.0

  • Reduce the number of times SELECT version() query is sent to Trino when using SQLAlchemy. (#371)
  • Fix TIMESTAMP WITH TIME ZONE being mapped to incorrect zones. (#366)

Release 0.323.0

  • Fix handling of Decimal params which use scientific notation. (#347)
  • Map Trino UUID type to Python uuid.UUID. (#354)
  • Map sqlalchemy.Uuid type to Trino UUID. (#359)
  • Support using timezone aware datetime.time params in prepared statements. (#360)
  • Allow accessing ROW type fields using their names in addition to their indices. (#338)
  • Interpret roles without catalog name as system roles for convenience. (#341)

Release 0.322.0

  • Return rowcount property on the DB-API Cursor when available. (#325)
  • Provide a read-only property query on the DB-API Cursor which contains the query text submitted through the cursor when available. (#323)
  • Automatically determine http_scheme, host and port from host if it's a valid URL. (#340)
  • Fix query cancellation to follow the protocol. Before this change cancelling a query could lead to errors from the Trino server. (#328)

Release 0.321.0

  • Add support for SQLAlchemy 2.0. (#307)
  • Add support for varbinary query parameters. (#299)
  • Add Cursor.describe method to return some metadata about the results of a query. (#302)
  • Add internal_size, precision and scale in Cursor.description. (#315)
  • Add support for chaining methods on Cursor.execute. (#279)
  • Fix bug where passing roles to Connection did not enable the provided roles. (#311)

Breaking Changes

  • The client now maps query results to Python types by default. In older versions this could be enabled explicitly by passing experimental_python_types=True to the trino.dbapi.connect method. To restore the old behaviour of mapping results to primitive types you can pass legacy_primitive_types=True to the trino.dbapi.connect method. See the documentation to learn more. (#305)
  • Add support for setting the session timezone. When not set explicitly it defaults to the client side local timezone. This changes the behaviour of the client in backward-incompatible way. To preserve the behaviour from client versions older than 0.321.0 you can explicitly pass timezone='UTC' to trino.dbapi.connect when creating the connection. (#27)
  • Add support for variable precision datetime types. This change makes temporal types contain the correct precision as computed by Trino instead of being always limited to millisecond precision. (#300)

Release 0.320.0

  • Fix handling of expired access tokens when using OAuth 2 authentication. (#284)
  • Support None values in array, map and row types when experimental_python_types is enabled. (#269)
  • Expose query id of most recently executed query on a cursor as Cursor.query_id. (#295)

Release 0.319.0

  • Improve the performance of get_view_names in SQLAlchemy. (#267)
  • Fix possible ValueError when client receives empty HTTP headers. (#262)
  • Fix a compatibility issue with _rfc_1738_quote in SQLAlchemy v1.4.42. (#273)
  • Return only tables in SQLAlchemy get_table_names. Previously, it also contained views. (#266)

Release 0.318.0

  • Fix the SQLAlchemy dialect to be compatible with SQLAlchemy 1.3.x versions. (#250)
  • Fix possible KeyError when using prepared statements. (#249)
  • Fix failure when calling get_table_comment using SQLAlchemy. (#253)

Release 0.317.0

  • Add support for creating tables containing JSON columns and reading and writing to them with SQLAlchemy. (#194)
  • Add support for setting roles by passing a dictionary of catalog name and role as the roles keyword argument to trino.dbapi.connect. (#230)
  • Add support for setting roles by adding the roles URL query parameter in SQLAlchemy connections to a JSON object with keys as the catalog name and values as the role name. (#230)
  • Add a function trino.sqlalchemy.URL to generate SQLAlchemy URLs which properly handles escaping and encoding values where needed. (#235)
  • Fix query failures not being propagated to the client when using fetchone. (#95)
  • Fix queries returning a single row from sometimes appearing as failed on the server. (#220)
  • Fix query failures when using SQLAlchemy TableClause by not performing catalog lookup. (#237)
  • Fix errors when using prepared statements with Trino versions greater than or equal to 398. (#242)

Breaking Changes

  • Block the execute method of the cursor until at least one row is received. Users no longer need to call fetchone or fetchall to ensure query starts executing on the Trino server. Note that results still need to be consumed by calling fetchone or fetchall to ensure that a query isn't considered idle and terminated on the server. (#232)

Release 0.316.0

  • Add support for SQLAlchemy queries to access multiple catalogs by specifying a trino_catalog argument to SQLAlchemy Table objects. (#186)
  • Improve performance when a cursor with experimental_python_types is used. (#206)
  • Fix incorrect results for get_table_comment in SQLAlchemy when two tables with the same name and schema exist in different catalogs. (#217)
  • Remove spurious logging of HTTP responses when a query is cancelled. (#216)

Older releases

Details for older releases are available in the tags list, the code itself, and the README documentation.