propagate null in equality comparisons (#9053)
formalize implode -> explode relation (#9038)
Drop subclassing support for DataFrame/LazyFrame (#9008)
consistently return list of date/datetime from lazy date_range (#8513)
Default date_range/ones/zeros to eager=False (#9007)
Rename list namespace accesor from .arr to .list (#8999)
disallow time zones other than those in zoneinfo.available_timezones() (#8993)
remove window expression magic (#8992)
raise error when sorted flag not set (#8994)
Drop subclassing support for GroupBy (#7746)
in Series constructor, if inputs are time-zone-aware datetimes, convert to UTC (#8881)
parse offset-naive date time strings as Timestamp(time_unit), offset-aware datetime strings as Timestamp(time_unit, "UTC"), and remove the utc argument (#8714)
Remove deprecated tz_aware argument (#8696)

🚀 Performance improvements

speed up write_csv for time-zone-aware columns (#9093)
parallelize rolling_window group materialization (#9095)
elide hot loop in hash joins (#9075)

✨ Enhancements

conversion from Utf8 to Decimal. (#9090)
default to checking sortedness in groupby_rolling… (#9063)
propagate null in equality comparisons (#9053)
warn if constructing Series with time-zone-aware datetimes (#9058)
implement apply for rolling/dynamic_groupby (#9049)
Support more data types in lazy repeat (#9046)
implement strategy=nearest for join_asof (#9024)
arr.sum expression (#9041)
formalize implode -> explode relation (#9038)
add array namespace and min/max expression (#9032)
improve error message on row-wise overflow (#9021)
properly apply slice at UNION level (#9018)
consistently return list of date/datetime from lazy date_range (#8513)
Default date_range/ones/zeros to eager=False (#9007)
disallow time zones other than those in zoneinfo.available_timezones() (#8993)
raise error when sorted flag not set (#8994)
in Series constructor, if inputs are time-zone-aware datetimes, convert to UTC (#8881)
parse offset-naive date time strings as Timestamp(time_unit), offset-aware datetime strings as Timestamp(time_unit, "UTC"), and remove the utc argument (#8714)

🐞 Bug fixes

rolling_groupy was returning incorrect results when offset was positive (#9082)
don't underflow on list.tail (#9089)
fix null/empty in List::take_unchecked (#9074)
repeat by (#9023)
raise in to_datetime/strptime if format contains hour but not minute directive (#9044)
Order of pl.Array arguments in docstring (#9059)
propagate nulls in broadcasting of order comparisons (#9050)
Improve read_parquet missing column error message (#8961)
fix apply with passed date/datetime return_dtype (#9035)
respect inner type in Array construction (#9020)
raise error on invalid aggregation (#9013)
fix fused arithmetic in window functions (#9012)
don't allow silent init of Series declared as int/temporal with floating point values (#9004)
deprecate time_unit property from Series (#8990)

🛠️ Other improvements

Improve expression parsing utils (#9094)
Refactor expression input parsing util (#9085)
Organize "as_datatype" functions (#9080)
Change eager path for repeat (#9048)
Clean up arange/date_range/time_range (#9027)
Drop subclassing support for DataFrame/LazyFrame (#9008)
minor SQLContext docstring cleanups (#9005)
Rename list namespace accesor from .arr to .list (#8999)
remove window expression magic (#8992)
Drop subclassing support for GroupBy (#7746)
refactor!(python): Remove old deprecated functionality (#8995)
Remove deprecated tz_aware argument (#8696)

Thank you to all our contributors for making this release possible! @CloseChoice, @MarcoGorelli, @alexander-beedie, @charliegallop, @jonashaag, @mcrumiller, @raymead, @ritchie46, @sorhawell, @stinodego, @tim-habitat and @universalmind303