polars-source-utils

Utilities for inspecting and rewriting source paths inside binary Polars LazyFrame plans.

from polars_source_utils import list_source_paths, replace_source_paths

paths = list_source_paths("data/node.plbin")
changed = replace_source_paths("data/node.plbin", {paths[0]: "/new/data.parquet"})

The functions are designed for workspace persistence flows that need to rebase absolute scan paths after moving a workspace folder. They do not collect the plan or rewrite underlying data files.

Plan traversal is exhaustive over Polars 1.44.1. Rewrites are serialized to a same-directory temporary file and atomically replace the original only after a successful flush and sync, so a serialization or persistence failure preserves the existing plan.

See the package architecture for the ownership boundary.

Development

uv sync
uv run maturin develop --release --locked
uv run pytest -q

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