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Pull requests list

PERF: prefix bloom filters for read_csv NA-value lookups
#66132 opened Jul 2, 2026 by jbrockmendel Member • Draft
3 tasks done
PERF: avoid transpose for axis=1 reductions on single-block DataFrames (GH#51474) Performance Memory or execution speed performance Reduction Operations sum, mean, min, max, etc.
#66131 opened Jul 2, 2026 by jbrockmendel Member • Draft
PERF: Series.isin for integer dtypes with small-range values Algos Non-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff Performance Memory or execution speed performance
#66130 opened Jul 2, 2026 by jbrockmendel Member • Draft
PERF: avoid argsort of uniques in safe_sort Algos Non-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff Groupby Performance Memory or execution speed performance
#66129 opened Jul 2, 2026 by jbrockmendel Member • Draft
PERF: pool skiplist node allocations for rolling median/quantile/rank Performance Memory or execution speed performance Window rolling, ewma, expanding
#66128 opened Jul 2, 2026 by jbrockmendel Member • Draft
PERF: reduce overhead in sorted merges and safe_sort Algos Non-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#66127 opened Jul 2, 2026 by jbrockmendel Member • Draft
PERF: render to_csv chunks natively, bypassing csv.writer Benchmark Performance (ASV) benchmarks IO CSV read_csv, to_csv Performance Memory or execution speed performance
#66126 opened Jul 2, 2026 by jbrockmendel Member • Draft
PERF: typed non-boxing path for get_indexer_non_unique Benchmark Performance (ASV) benchmarks Index Related to the Index class or subclasses Performance Memory or execution speed performance
#66125 opened Jul 2, 2026 by jbrockmendel Member • Draft
PERF: single-pass composite-key factorization for multi-key merges Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#66124 opened Jul 2, 2026 by jbrockmendel Member • Draft
PERF: faster to_datetime parsing of timezone-aware strings Performance Memory or execution speed performance Timezones Timezone data dtype
#66123 opened Jul 2, 2026 by jbrockmendel Member • Draft
BUG: select_dtypes support non-nanosecond dt64/td64 units (GH#40234) Bug Datetime Datetime data dtype Dtype Conversions Unexpected or buggy dtype conversions Timedelta Timedelta data type
#66122 opened Jul 2, 2026 by jbrockmendel Member • Draft
1
PERF: merge_asof with by Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#66121 opened Jul 2, 2026 by jbrockmendel Member • Draft
BUG: select_dtypes string form of an extension dtype matches exact dtype (GH#40234, GH#59888) Arrow pyarrow functionality Bug Dtype Conversions Unexpected or buggy dtype conversions NA - MaskedArrays Related to pd.NA and nullable extension arrays
#66120 opened Jul 2, 2026 by jbrockmendel Member • Draft
1
BUG: select_dtypes dtype instances match exactly (GH#40234) Bug Dtype Conversions Unexpected or buggy dtype conversions ExtensionArray Extending pandas with custom dtypes or arrays.
#66119 opened Jul 2, 2026 by jbrockmendel Member • Draft
BUG: select_dtypes with an ExtensionDtype subclass (GH#65366) Bug Dtype Conversions Unexpected or buggy dtype conversions
#66118 opened Jul 2, 2026 by jbrockmendel Member • Draft
BUG: interpolate leaving NAs unfilled for pyarrow dtypes
#66117 opened Jul 2, 2026 by apoorvdarshan Loading…
4 tasks done
1
BUG: assert_categorical_equal with check_category_order=False mishandles NaN (#62008)
#66116 opened Jul 2, 2026 by PranavAchar01 Loading…
4 tasks done
1
1
BUG: memory leak in json serialization for timestamp with timezone
#66115 opened Jul 2, 2026 by Alvaro-Kothe Member Loading…
4 of 7 tasks
1
2
REF: hoist infer_dtype_from_object into DataFrame.select_dtypes Refactor Internal refactoring of code
#66113 opened Jul 2, 2026 by jbrockmendel Member • Draft
REF: build select_dtypes predicate from per-dtype callables Refactor Internal refactoring of code
#66112 opened Jul 1, 2026 by jbrockmendel Member Loading…
BUG: Fix NaN validity mask synchronization in FloatingArray and to_numeric (#63732)
#66110 opened Jul 1, 2026 by GiTaDi-CrEaTe Loading…
2 tasks done
1
1
BUG: Fix HTML escaping for URLs in DataFrame.to_html (#66080)
#66109 opened Jul 1, 2026 by GiTaDi-CrEaTe Loading…
3 tasks done
1
1
BUG: DataFrame.loc partial assignment upcasting dtype of untouched columns
#66106 opened Jun 30, 2026 by gautamvarmadatla Contributor Loading…
6 of 7 tasks
1
BUG: pivot_table margins drop valid rows when dropna=True and aggfunc is dict (GH#65765)
#66103 opened Jun 30, 2026 by anzinmhd Contributor Loading…
3 tasks done
1
2
BLD: build wheels against the oldest supported numpy (py3.14 segfault)
#66090 opened Jun 29, 2026 by jbrockmendel Member • Draft
5
7
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