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Pull requests: pandas-dev/pandas
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perf: add fast-path for homogeneous RangeIndex in union_indexes
#66301
opened Jul 12, 2026 by
muhamedfazalps
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CI: Update pixi.lock
CI
Continuous Integration
#66300
opened Jul 12, 2026 by
github-actions
Bot
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fix: improve error message for nested list with scalar level in set_levels/set_codes
#66299
opened Jul 12, 2026 by
muhamedfazalps
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fix: correct error message for merge_asof tolerance validation
#66298
opened Jul 12, 2026 by
muhamedfazalps
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BUG: Save and restore user SQLite adapters in to_sql() (GH#64337)
#66297
opened Jul 11, 2026 by
q121212
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4 tasks done
BUG: Register SQLite adapters only once per process (GH#64337)
#66296
opened Jul 11, 2026 by
q121212
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5 tasks done
BUG: concat DatetimeIndex freq depends on input order (GH#64253)
#66295
opened Jul 11, 2026 by
gaurav0107
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4 tasks done
DOC: Clarify list/tuple vs array-like handling in merge/join parameters (#44077)
#66294
opened Jul 11, 2026 by
hanu-14
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ENH: Add RangeIndex union fast-path in union_indexes
#66293
opened Jul 11, 2026 by
rajat315315
Contributor
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5 of 7 tasks
BUG: IntervalDtype Arrow round-trip for tz-aware datetime subtypes
#66291
opened Jul 11, 2026 by
ShashwatAgrawal20
Contributor
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5 tasks done
BUG: merge_asof error says "tolerance must be positive" but accepts tolerance=0
#66290
opened Jul 11, 2026 by
nikolauspschuetz
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7 tasks done
BUG: fix self-contradictory set_levels/set_codes message for nested value with scalar level
#66288
opened Jul 11, 2026 by
nikolauspschuetz
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7 tasks done
BUG: assert_series_equal reports misleading 'Series classes are different' for backing-array subclass mismatch
#66284
opened Jul 10, 2026 by
arham766
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4 tasks done
ENH: Add transparent JIT compilation engine support to Series.apply
#66282
opened Jul 10, 2026 by
rajat315315
Contributor
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6 of 7 tasks
PERF: read_csv fast paths for nullable and pyarrow-backed EA dtypes
IO CSV
read_csv, to_csv
Performance
Memory or execution speed performance
#66279
opened Jul 10, 2026 by
jbrockmendel
Member
•
Draft
PERF: GIL-free loop, fixed-layout fast path and same-date cache for the read_csv parse_dates fastpath
IO CSV
read_csv, to_csv
Performance
Memory or execution speed performance
#66278
opened Jul 10, 2026 by
jbrockmendel
Member
•
Draft
PERF: build read_csv pyarrow string columns without the GIL, deferring the wrap
IO CSV
read_csv, to_csv
Performance
Memory or execution speed performance
#66277
opened Jul 10, 2026 by
jbrockmendel
Member
•
Draft
PERF: consolidate read_csv token metadata into a single word_ends array
IO CSV
read_csv, to_csv
Performance
Memory or execution speed performance
#66276
opened Jul 10, 2026 by
jbrockmendel
Member
•
Draft
PERF: rework parallel read_csv gather and worker structure
IO CSV
read_csv, to_csv
Performance
Memory or execution speed performance
#66275
opened Jul 10, 2026 by
jbrockmendel
Member
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PERF: SIMD block fast lane in the read_csv tokenizer
IO CSV
read_csv, to_csv
Performance
Memory or execution speed performance
#66274
opened Jul 10, 2026 by
jbrockmendel
Member
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PERF: probe before allocating in read_csv dtype inference
IO CSV
read_csv, to_csv
Performance
Memory or execution speed performance
#66273
opened Jul 10, 2026 by
jbrockmendel
Member
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PERF: free read_csv parser buffers without the GIL on close
IO CSV
read_csv, to_csv
Performance
Memory or execution speed performance
#66272
opened Jul 10, 2026 by
jbrockmendel
Member
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PERF: read_csv grow_buffer single realloc instead of doubling chain
IO CSV
read_csv, to_csv
Performance
Memory or execution speed performance
#66271
opened Jul 10, 2026 by
jbrockmendel
Member
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DEPR: Treat tuple keys consistently in Resampler.__getitem__
#66270
opened Jul 10, 2026 by
EsDeath-Boop
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What’s not been updated in a month: updated:<2026-06-12.