Added note that values are joined with a space before parsing for the combined column cases.

* REGR: fix read_parquet with column of large strings (avoid overflow from concat)

* comment ...

* BUG: Groupby not keeping string dtype for empty objects

* Fix

---------

Co-authored-b...

Co-authored-by: Matthew Roeschke <[email protected]>

* Fix rolling microseconds for sum

* - adding a test for rounding sum

* Update pandas/test...

* Remove old commentary, clean up skipping sqlalchemy

* Refactor test

* Split out Datetime...

* BUG: BusinessDay addition with non-nano

* GH ref

* fix nanos case

* REGR: Groupby methods not supporting numba raising TypeError when the global option is set

...

* factorize by keys for merge_asof

* use intp_t

* add test

* whatsnew

* ensure int64

* Collect Timedelta tests

* organize tests

* typo fixup

* mypy fixup

* REF: collect Timestamp tests by method

* mypy fixup

I am not sure that this is uncontested that this is a good version
pin change. I also took the...

* TST: check names in test_readers.py

* de-duplicate

fix regression in merge_asof by datelike

* BUG: mode not sorting values for arrow backed strings

* Fix tests

* Change to pa_install...

* BUG: DTA/TDA constructors with mismatched values/dtype resolutions

* mypy fixup

* BUG: infer_string not inferring string dtype when NA is first value

* Update lib.pyx

* reportIncompatibleMethodOverride

* BooleanDtype.na_value is a property

* fix Timestamp.c...

* add dictionary OFFSET_DEPR_FREQSTR, change warning msg

* rename Q to QE for offsets

* co...

* Add types for pandas.DataFrame.map

* Made some changes:
- Removed stub and test for applym...

* correct convert_json_field_to_pandas_type

* fix pre-commit errors

* correct def convert_...

* REF: dont test intermediate constructor helpers

* avoid unnecessary copy

* BUG: NaT instead of error for timestamp

* Timestamp

* whatsnew entry

* added actual b...

* TST: added failing tuple tests for `str.startswith` and `str.startswith` (#54942)

* FIX: ad...

* TST: change pyarrow skips to xfails

* revert edits where CI is different from local

----...

* REF: implement ParseState

* REF: inline convert_timezone

* ParseState->DatetimeParseState

* BUG: pytables with non-nano dt64

* GH ref

* fix whatsnew

Co-authored-by: Matthew Roeschke <[email protected]>

for offsets deprecated frequency replaced UserWarning with FutureWarning

* DEPS: Bump optional dependencies

* Clean up some version checks

* Address old pyarrow ch...

* ENH: Add numba engine to df.apply

* complete?

* wip: pass tests

* fix existing tests
...

* improve perf in merge_asof with multiple "by" keys

* whatsnew

* add test for EA dtypes
...

* replace cpplint with clang-format

* fixups

* use conda for clang-format

* language: c...

* BUG: inferred_freq with non-nano

* GH ref

* TST: move test files to methods/ directory

* REF: tz_localize tests

* implement test_rou...

Co-authored-by: Joris Van den Bossche <[email protected]>

* added assert

* review comment

* correct message for parsing datetimes with mixed time zones

* correct tests

* Update generic.py

* Update generic.py

* Update generic.py

* CLN: split large tests

* REF: misplaced tests

* TST: improve tet

* comment

* TST: ...

* BUG: DateOffset addition with non-nano

* Update doc/source/whatsnew/v2.2.0.rst

Co-author...

* DOC: Correct groupby().mean() usage in table layout getting started article

* DOC: Explicit...

* PERF: read_stata for wide columns

* Add PR number

* Remove unused variable

* typing
...

* Ensure "string[pyarrow]" type is preserved when calling extractall

* Add whatsnew note

*...

* fix pow with missing operand

* move to 2.2.0

* Update doc/source/whatsnew/v2.2.0.rst

...

* BUG: Week.__add__ with non-nano

* GH ref

* typo fixup

* floordiv fix

* docs

* docs

* try fix

* revert

* precommit

* Update doc/sourc...

* EHN: allow for to_sql `multi` method with oracle backend

* add explanation why conn.execute...

* DEPR: create_block_manager_from_blocks

* lint fixup

* DEPR: Previous implementation of DataFrame.stack

* Remove DataFrame.stack docs on dropping ...

* DOC: Remove explicit paths from references

* revert

* BUG: Don't clean docs and open browser in code_checks

* fixup

* ENH: BaseStringArray._from_scalars

* WIP: EA._from_scalars

* ENH: implement EA._from_sca...

* BUG: DataFrame.to_json OverflowError with np.long* dtypes

* BUG: DataFrame.to_json Overflow...

MAINT: Partially revert np.int_ changes

* rename BM, CBM to BME, CBME for offsets

* fix tests

* correct docs

* add tests, add n...

* REF: implement disallow_ambiguous_unit

* REF: implement get_unit_for_round

* REF: implement Index._format_flat, _format_multi

* de-duplicate, change keyword

* DEPR: ...

* REF: share Index/Block get_values_for_csv

* mypy fixup

* BUG: tslibs uncaught overflows

* GH refs

* windows/32bit builds

* updated parameter definitions

* revert memview -> ndarray declaration

* BUG: categorical dtype equality for level in different type

* BUG: categorical dtype equali...

* BLD: Pin numpy to < 2

* typo

* Update action.yml

* Update unit-tests.yml

* REF: Add tests.groupby.methods

* Merge cleanup

* Refactor

* Refactor

* Show value ...

* TST: Close ad-hoc db connections

* Add runtime import