polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- Inconsistency on `pl.len()` for 1-column CSV with BOM and blank line (fast_count)
- Expand ewm expressions
- Cannot partition files in S3
- Explicit `engine` argument to `LazyFrame.collect` is overridden by `"streaming"` engine affinity
- LazyFrame sink_csv: batch_size and sync_on_close are not respected
- `read_ndjson` does not retain column order for 33 or more columns
- Full slice pushdown for io plugins
- `DataFrame(orient='row')` returns 0 rows if first item is empty
- Markdown table output does not have padding on header delimiter row
- pl.element().replace_strict(...) consumes too much memory
- Docs
- Rust not yet supported