polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- `map_batches` with `projection_pushdown=True` invokes UDFs with wrong schema/shape
- Schema needed for SQL Struct Fields when selecting json
- impl Deserialize for ChunkedArray
- Add `GroupBy.group_by`
- Add `fetch_timeout()` in `InProcessQuery`
- Race condition in `InProcessQuery::collect_concurrently` and `fetch` causes panic
- `concat_arr` should cast its expressions to their supertype like `concat_list`
- read_delta does not support absolute file:// paths in delta lake table log entries
- is_in raises TypeError when comparing column with a list of enums since 1.28.0
- Rolling map with a lambda function fails quietly during debug in Vs Code.
- Docs
- Rust not yet supported