polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- Parquet predicate pushdown not working for Struct columns
- #[cfg(feature = "async")] features (collect_batches) completely missing in 0.52.0 crate
- scan_delta file skip predicate not working for bool dtype
- Inconsistent output for pl.List.head/.filter with nulls
- collect_all asserts fail with group_by
- Categorical multi file parquet scan leads to OOM, low cardinality column seems to not skip row groups, unused categories after .collect()
- Schema as dataclasses
- `s[idx] += 1` silently no-ops depending on the type of `idx`
- Remove usage of mmap
- replace_strict shouldn't coerce numeric entries into strings
- Docs
- Rust not yet supported