airflow-serde-polars

how to install

pip install airflow-serde-polars

how to use

You don't need to call it specifically after installation. Serialization is done automatically when passing frames to XCOM.

example dag

from __future__ import annotations

from typing import TYPE_CHECKING

from pendulum import datetime

from airflow.decorators import dag, task

if TYPE_CHECKING:
    import polars as pl


@dag(start_date=datetime(2024, 1, 1), schedule=None, catchup=False)
def polars_sample():
    @task.python(do_xcom_push=True)
    def return_polars_frame() -> pl.DataFrame:
        import polars as pl

        return pl.DataFrame(
            {
                "a": [1, 2, 3],
                "b": [4, 5, 6],
            }
        )

    @task.python(do_xcom_push=False)
    def print_polars_frame(df: pl.DataFrame) -> None:
        from pprint import pprint

        pprint(df)

    frame = return_polars_frame()
    show = print_polars_frame(frame)  # pyright: ignore[reportArgumentType]

    _ = frame >> show


polars_sample()

Is this an airflow provider?

It's created for a similar purpose, but it's not a provider. The airflow providers meta information does not define a serializer.

When I am able to enter the provider meta information as a serializer, I will update the library to match the provider conditions.