Release Notes

November 2026

We have released version 0.2.0 of the fivetran-connector-sdk-core PyPI package. This release includes the following updates:

Logs a warning when the core changes a value, such as storing a NaN or a number with too many digits as NULL, or removing null characters from text.
Improved the error messages of fivetran run for an Iceberg catalog, so that they say which setting or table to fix.

We have released version 0.1.0 of the fivetran-connector-sdk-core PyPI package. The package runs your connector on your machine for fivetran debug and fivetran run. It is installed automatically with fivetran-connector-sdk version 3.0.0. This release includes the following:

Runs your connector in the same Python process as the command, and writes the data to a local DuckDB file, files/warehouse.db. The CLI no longer downloads a separate tester.
Applies the same rules for types, naming, primary keys, deletes, truncates, schema changes, and checkpoints that Fivetran applies to a deployed connector.
Writes the data to an Apache Iceberg REST catalog when you use fivetran run. For how the package fits with the SDK, see fivetran-connector-sdk-core.