pola-rs/polars

Support HDF5 reading/writing (with optional dependencies)

Open

#3,520 opened on May 28, 2022

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 (48 comments) (45 reactions) (0 assignees)Rust (38,496 stars) (2,826 forks)batch import
A-ioacceptedenhancementhelp wantedpython

Description

We can reduce friction by figuring out how to load data most efficiently to polars memory.

Contributor guide

Tech stack
rust
Domain
databackend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
Rust programmingPolars I/O APIHDF5 format knowledge
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
This issue proposes adding HDF5 reading/writing to Polars. Given the lengthy discussion, a contributor should first read through all comments to understand previous design considerations. The key files to examine are likely in the `polars io` crate, such as `src/serde.rs` or similar. One should consider leveraging an existing Rust HDF5 library like `hdf5` or `hdf5 rs`. The implementation must integrate with Polars' lazy and eager APIs. No linked PR exists, so this is open for fresh exploration.