Polars: py-0.15.15 Release

✨ Enhancements

• ensure ooc sort works ooc with all-constant values (#6235)
• The 1 billion row sort (#6156)
• optionally treat missing UTF8 values as the empty string at CSV parse-time (#6203)
• check file target is not an existing directory (#6187)
• support -ve indexing for DataFrame head and tail methods (#6173)
• Implement DataFrame.unique(keep="none") (#6169)
• support use of explicit Struct dtypes on DataFrame/Series init (#6145)

🐞 Bug fixes

• Add list inner dtype when printing Series (#6233)
• strptime now respects pl.Datetime's time_unit (#6231)
• fix when then otherwise with arity and aggregation… (#6224)
• collect now uses the storage_options given to scan_parquet (#6223)
• set_sorted keep schema (#6222)
• pass name to value counts in aggregation (#6221)
• don't set fast_explode on list of structs (#6220)
• address a frame init/construction error, and expose infer_schema_length to frame init (#6210)
• explode of empty nullable list (#6190)
• fix oob arr.take (#6189)
• Make with_columns in with_columns_kwargs mode compatible with more data types (#6126)
• Update docstring with_columns to reflect a new dataframe is being returned (#6122)
• fix empty streaming joins (#6149)
• fix streaming joins where the join order has been … (#6143)
• write tz-aware datetimes to csv (#6135)
• add null behavior for oob indices (#6133)

🛠️ Other improvements

• Create DataFrame from schema (#6225)
• don't set aggregated flag on null propagated aggregation. (#6191)
• undo cargo.toml change (#6219)
• Improve drop_nulls docstrings (#6127)
• Clarify docstrings for closed argument (#6198)
• minor docs and typing updates (plus additional test coverage for related areas) (#6182)
• explain n_field_strategy (#6158)

Thank you to all our contributors for making this release possible! @MarceColl, @MarcoGorelli, @alexander-beedie, @gab23r, @ghuls, @jvanbuel, @n8henrie, @rben01, @ritchie46, @ropoctl, @sorhawell, @stinodego, @winding-lines and @zundertj