polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- fix: Load Delta partition values from the log in `scan_delta`
- Partitioned write puts a NULL key and the string "__HIVE_DEFAULT_PARTITION__" into the same file: rows silently lost, file sometimes unreadable
- Allow explicit pruning of unused inputs in lazy horizontal concatenation
- INT96 timestamps inside a Map saturate although the schema requests Datetime("us")
- perf: Widen skip-batch null_count for mapped struct columns instead of nulling it
- fix: Only parse hive partitions below the table root in `scan_delta`
- feat: Add foldv for stateful processing
- feat(python): Allow foreign types to implement binary operators against `Expr`
- Run constant folding bottom up instead of top down.
- fix: Error on mismatched length in zip node when input data has one row
- Docs
- Rust not yet supported