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PERF: filled float reductions stop paying for missing values that are not there
#76opened 10-11 15:19 by pandas-bot· merged 10-11 15:20session 10-11 14:30
1
PERF: accumulations copy their values only where they have to write
#75opened 10-11 14:24 by pandas-bot· merged 10-11 14:25session 10-11 13:35
1
PERF: build the skipna=False accumulation mask from its first NA
#73opened 10-11 13:28 by pandas-bot· merged 10-11 13:29session 10-11 12:51
1
PERF: nullable reductions skip the mask when nothing is missing
#72opened 10-11 11:13 by pandas-bot· merged 10-11 11:14session 10-11 10:34
1
PERF: count non-NA values without widening the mask to int64
#71opened 10-11 10:29 by pandas-bot· merged 10-11 10:30session 10-11 09:53
1
PERF: float cumulative accumulations ask for an NA before preparing for one
#70opened 10-11 09:48 by pandas-bot· merged 10-11 09:49session 10-11 08:56
1
PERF: clip with scalar bounds in one pass instead of five per bound
#69opened 10-11 08:26 by pandas-bot· merged 10-11 08:44session 10-11 07:45
1
PERF: float idxmin/idxmax stop building an NA mask they do not need
#68opened 10-08 12:19 by pandas-bot· merged 10-08 12:26session 10-08 11:37
1
PERF: min/max and idxmin/idxmax stop building an NA mask they do not need
#67opened 10-08 10:22 by pandas-bot· merged 10-08 10:24session 10-08 09:35
1
PERF: datetimelike comparisons stop paying for a NaT mask they do not need
#66opened 10-08 09:24 by pandas-bot· merged 10-08 09:25session 10-08 08:34
1
PERF: descending integer sort_values stops copying into a second buffer
#65opened 10-08 07:21 by pandas-bot· merged 10-08 07:23session 10-08 06:34
1
PERF: sort_values(ignore_index=True) stops building the index it discards
#64opened 10-08 05:21 by pandas-bot· merged 10-08 05:23session 10-08 04:33
1
PERF: rank stops building the two arrays it never reads
#62opened 10-07 02:12 by pandas-bot· merged 10-07 02:13session 10-07 01:37
0
PERF: describe stops building per-column objects it discards
#61opened 10-06 21:29 by pandas-bot· merged 10-06 22:09session 10-06 20:28
1
PERF: 1D quantile_with_mask reduces the values as they are
#60opened 10-06 16:11 by pandas-bot· merged 10-06 16:12session 10-06 15:18
1
PERF: Series.quantile computes on its 1D values
#59opened 10-06 09:43 by pandas-bot· merged 10-06 09:45session 10-06 09:11
1
PERF: describe does its per-column constant work once
#58opened 10-06 09:06 by pandas-bot· merged 10-06 09:07session 10-06 08:24
0
PERF: Index.sort_values sorts the values when no indexer is asked for
#57opened 10-05 23:24 by pandas-bot· merged 10-05 23:24session 10-05 22:23
0
PERF: iterate an arrow array in batches instead of one scalar at a time
#56opened 10-05 13:13 by pandas-bot· merged 10-05 13:21session 10-05 12:45
0
PERF: resolve a partial option name from a memo instead of rescanning the registry
#55opened 10-05 07:43 by pandas-bot· merged 10-05 07:45session 10-05 06:58
1
PERF: rank only sorts on the missing-value key when it can change the answer
#54opened 10-05 01:43 by pandas-bot· merged 10-05 01:43session 10-05 00:56
0
PERF: do not resolve a dtype argument astype cannot use
#53opened 10-04 19:38 by pandas-bot· merged 10-04 19:38session 10-04 19:06
1
PERF: resolve a plain numpy dtype string without consulting the registry
#52opened 10-04 17:41 by pandas-bot· merged 10-04 17:42session 10-04 16:59
1
PERF: answer the empty column projection by slicing
#51opened 10-04 15:45 by pandas-bot· merged 10-04 15:46session 10-04 15:16
0
PERF: answer a contiguous column projection by slicing
#50opened 10-04 14:00 by pandas-bot· merged 10-04 14:01session 10-04 13:17
0
PERF: wrap a pyarrow result without re-validating it
#49opened 10-04 13:11 by pandas-bot· merged 10-04 13:12session 10-04 12:32
1
PERF: locate a dtype mapping's keys without building an Index over them
#48opened 10-04 09:55 by pandas-bot· merged 10-04 09:55session 10-04 09:28
0
PERF: appending a column pays only for appending
#47opened 10-04 08:13 by pandas-bot· merged 10-04 08:16session 10-04 07:41
1
PERF: look up to_datetime's cache with the positions the unique pass found
#46opened 10-04 03:00 by pandas-bot· merged 10-04 03:01session 10-04 02:24
2
PERF: invert groupby's group-id permutations without sorting
#45opened 10-04 01:02 by pandas-bot· merged 10-04 01:03session 10-04 00:09
1
PERF: sort safe_sort's integer and datetimelike keys with numpy's radix sort
#44opened 10-04 00:03 by pandas-bot· merged 10-04 00:04session 10-03 23:28
1
PERF: stop BlockManager.insert counting every block on every insert
#43opened 10-03 22:08 by pandas-bot· merged 10-03 22:08session 10-03 21:20
0
PERF: stop ArrowExtensionArray.insert fragmenting its backing ChunkedArray
#42opened 10-03 21:13 by pandas-bot· merged 10-03 21:14session 10-03 20:25
1
PERF: trust the uniqueness of a Categorical grouper's taken categories
#40opened 10-03 19:16 by pandas-bot· merged 10-03 19:17session 10-03 18:50
0
PERF: restore a Categorical grouper's original categories from the map it already has
#38opened 10-03 18:42 by pandas-bot· merged 10-03 18:43session 10-03 18:03
1
PERF: read a Categorical grouper's groups without rescanning its codes
#36opened 10-03 17:56 by pandas-bot· merged 10-03 17:57session 10-03 17:13
0
PERF: order an unobserved Categorical grouper's groups by appearance without hashing its categories
#35opened 10-03 16:01 by pandas-bot· merged 10-03 16:02session 10-03 15:24
1
PERF: recode a partially-observed Categorical grouper without hashing its categories
#34opened 10-03 15:02 by pandas-bot· merged 10-03 15:06session 10-03 14:33
1
PERF: find a Categorical grouper's used categories by counting, not hashing
#33opened 10-03 13:18 by pandas-bot· merged 10-03 13:22session 10-03 12:48
0
PERF: count used category codes instead of sorting them
#32opened 10-03 12:40 by pandas-bot· merged 10-03 12:41session 10-03 12:18
1
PERF: nargsort should not split on a mask that is all False
#31opened 10-03 12:13 by pandas-bot· merged 10-03 12:14session 10-03 11:39
1
PERF: pyarrow-backed Index.insert should splice chunks, not rebuild
#30opened 10-03 09:38 by pandas-bot· merged 10-03 09:41session 10-03 09:06
1
PERF: internal get_option calls should not pattern-match the option registry
#29opened 10-03 08:59 by pandas-bot· merged 10-03 09:00session 10-03 08:10
1
PERF: np.asarray(df) should not build the dtypes Series to read one dtype
#28opened 10-03 08:04 by pandas-bot· merged 10-03 08:05session 10-03 07:30
1
CLN: put BlockManager.get_dtype only where it is correct
#27opened 10-03 07:25 by pandas-bot· merged 10-03 07:25session 10-03 06:52
0
PERF: read a DataFrame column's dtype without building the dtypes Series
#26opened 10-03 07:18 by pandas-bot· merged 10-03 07:24session 10-03 06:52
1
PERF: sort merge's string key dictionary inside pyarrow
#25opened 10-03 05:40 by pandas-bot· merged 10-03 05:41session 10-03 05:14
2
PERF: skip the duplicate check on merge's sorted uniques
#24opened 10-03 05:09 by pandas-bot· merged 10-03 05:10session 10-03 04:42
2
PERF: invert safe_sort's permutation by scatter instead of argsort
#23opened 10-02 23:36 by pandas-bot· merged 10-02 23:37session 10-02 23:01
2
PERF: stack same-dtype columns into their block in one numpy call
#22opened 10-02 22:07 by pandas-bot· merged 10-02 22:09session 10-02 21:32
2
PERF: skip known-miss type checks on the dict construction path
#21opened 10-02 21:27 by pandas-bot· merged 10-02 21:28session 10-02 21:04
2
PERF: skip the no-op half of NDFrame.__finalize__
#20opened 10-02 20:49 by pandas-bot· merged 10-02 21:01session 10-02 20:25
3
PERF: let a redundant dtype= reach the sanitize_array fast path
#19opened 10-02 19:32 by pandas-bot· merged 10-02 19:34session 10-02 19:13
2
PERF: cheaper per-column helpers on the DataFrame/Series dict construction path
#18opened 10-02 19:09 by pandas-bot· merged 10-02 19:09session 10-02 18:36
2
PERF: return 1D numpy arrays from sanitize_array without dispatch
#17opened 10-02 18:31 by pandas-bot· merged 10-02 18:32session 10-02 18:09
2
PERF: allocate the engine's object array once for Arrow-backed indexes
#16opened 10-02 18:04 by pandas-bot· merged 10-02 18:05session 10-02 17:49
1
PERF: make the pandas ABC isinstance checks ~2x cheaper
#15opened 10-02 17:44 by pandas-bot· merged 10-02 17:45session 10-02 17:00
1
PERF: cast only the named columns in DataFrame.astype(mapping)
#14opened 10-02 16:53 by pandas-bot· merged 10-02 16:54session 10-02 16:17
1
PERF: do not build the discarded key labels in DataFrame.__getitem__
#13opened 10-02 16:12 by pandas-bot· merged 10-02 16:14session 10-02 15:51
1
PERF: skip the key Index round trip in list-like string label selection
#12opened 10-02 15:41 by pandas-bot· merged 10-02 15:45session 10-02 15:21
1
PERF: only reindex a list-like key when a label is actually missing
#11opened 10-02 15:14 by pandas-bot· merged 10-02 15:15session 10-02 14:23
1
CLN: correct the stated reason for keeping lexsort on object rank
#10opened 10-02 14:20 by pandas-bot· merged 10-02 14:20session 10-02 13:29
0
PERF: rank only pays for a lexsort when the mask is non-empty
#9opened 10-02 14:10 by pandas-bot· merged 10-02 14:11session 10-02 13:29
1
PERF: skip maybe_convert_objects' numeric work buffers when they cannot be read
#7opened 10-02 12:53 by pandas-bot· merged 10-02 12:54session 10-02 11:58
1
PERF: skip the listlike-indexer cast when the target already has our dtype
#6opened 10-02 11:54 by pandas-bot· merged 10-02 11:54session 10-02 11:38
1
PERF: skip factorize in MultiIndex.from_product for sorted unique Index levels
#5opened 10-02 11:35 by pandas-bot· merged 10-02 11:49session 10-02 11:01
2
PERF: speed up pandas_dtype for dtype strings
#2opened 10-02 10:10 by pandas-bot· merged 10-02 10:56session 10-02 09:18
1

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