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Title:
ENH: Serialize view of ArrowStringArray Β· Issue #42600 Β· pandas-dev/pandas
Description:
Currently Pandas serializes views of ArrowStringArrays by serailizing the whole thing, rather than a subset. Here is an example: In [1]: import pandas as pd In [2]: s = pd.Series([c * 1000 for c in "abcdefghijklmnopqrstuvwxyz"]) In [3]: ...
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pandas, issue, tomaugspurger, data, pyarrow, maartenbreddels, sign, import, pickle, commented, parquet, string, type, projects, serialize, closed, added, mroeschke, navigation, pull, requests, actions, security, enh, view, arrowstringarray, mrocklin, subset, abcdefghijklmnopqrstuvwxyz, pieces, enhancement, triage, reviewed, team, member, contributor, upstream, lenpickledumpsa, work, arrowbacked, feather, strings, extension, readpickle, topickle, arrow, functionality, github, milestone, footer,
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/vaexio/vaex/blob/caed2cf106007c6a0141a02a5dfdf823fa38799e/packages/vaex-core/vaex/arrow/convert org/jira/browse/arrow-10739 arrow-backed data string data type arrow-backed array personal information enh pandas serializes views upstream pyarrow issue comment metadata assignees tomaugspurger closed string[pyarrow] type projects fastest version/workaround import pandas pandas dataframes tomaugspurger reopened import pyarrow pyarrow side projects milestone triage issue pandas nice sharing underlying technologies milestone relationships import pickle serialize view small pieces to_pickle pickling subset issue //github github array upstream //issues workaround version pickle serialize subset pieces sign skip jump arrowstringarrays serailizing thing pd = pd series
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DiscussionForumPosting:
context:https://schema.org
headline:ENH: Serialize view of ArrowStringArray
articleBody:Currently Pandas serializes views of ArrowStringArrays by serailizing the whole thing, rather than a subset. Here is an example:
```python
In [1]: import pandas as pd
In [2]: s = pd.Series([c * 1000 for c in "abcdefghijklmnopqrstuvwxyz"])
In [3]: s
Out[3]:
0 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa...
1 bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb...
2 cccccccccccccccccccccccccccccccccccccccccccccc...
3 dddddddddddddddddddddddddddddddddddddddddddddd...
4 eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee...
5 ffffffffffffffffffffffffffffffffffffffffffffff...
6 gggggggggggggggggggggggggggggggggggggggggggggg...
7 hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh...
8 iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii...
9 jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj...
10 kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk...
11 llllllllllllllllllllllllllllllllllllllllllllll...
12 mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm...
13 nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn...
14 oooooooooooooooooooooooooooooooooooooooooooooo...
15 pppppppppppppppppppppppppppppppppppppppppppppp...
16 qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq...
17 rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr...
18 ssssssssssssssssssssssssssssssssssssssssssssss...
19 tttttttttttttttttttttttttttttttttttttttttttttt...
20 uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu...
21 vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv...
22 wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww...
23 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx...
24 yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy...
25 zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz...
dtype: object
In [4]: import pickle
In [5]: len(pickle.dumps(s))
Out[5]: 26758
In [6]: len(pickle.dumps(s.astype("string[pyarrow]")))
Out[6]: 26891
In [7]: len(pickle.dumps(s.head(5)))
Out[7]: 5632
In [8]: len(pickle.dumps(s.astype("string[pyarrow]").head(5)))
Out[8]: 26891
```
This negatively affects dask dataframe operations that cut up pandas dataframes into small pieces, moves them around to different computers, and then pieces them back together again.
author:
url:https://github.com/mrocklin
type:Person
name:mrocklin
datePublished:2021-07-19T00:32:53.000Z
interactionStatistic:
type:InteractionCounter
interactionType:https://schema.org/CommentAction
userInteractionCount:4
url:https://github.com/42600/pandas/issues/42600
context:https://schema.org
headline:ENH: Serialize view of ArrowStringArray
articleBody:Currently Pandas serializes views of ArrowStringArrays by serailizing the whole thing, rather than a subset. Here is an example:
```python
In [1]: import pandas as pd
In [2]: s = pd.Series([c * 1000 for c in "abcdefghijklmnopqrstuvwxyz"])
In [3]: s
Out[3]:
0 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa...
1 bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb...
2 cccccccccccccccccccccccccccccccccccccccccccccc...
3 dddddddddddddddddddddddddddddddddddddddddddddd...
4 eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee...
5 ffffffffffffffffffffffffffffffffffffffffffffff...
6 gggggggggggggggggggggggggggggggggggggggggggggg...
7 hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh...
8 iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii...
9 jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj...
10 kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk...
11 llllllllllllllllllllllllllllllllllllllllllllll...
12 mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm...
13 nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn...
14 oooooooooooooooooooooooooooooooooooooooooooooo...
15 pppppppppppppppppppppppppppppppppppppppppppppp...
16 qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq...
17 rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr...
18 ssssssssssssssssssssssssssssssssssssssssssssss...
19 tttttttttttttttttttttttttttttttttttttttttttttt...
20 uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu...
21 vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv...
22 wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww...
23 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx...
24 yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy...
25 zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz...
dtype: object
In [4]: import pickle
In [5]: len(pickle.dumps(s))
Out[5]: 26758
In [6]: len(pickle.dumps(s.astype("string[pyarrow]")))
Out[6]: 26891
In [7]: len(pickle.dumps(s.head(5)))
Out[7]: 5632
In [8]: len(pickle.dumps(s.astype("string[pyarrow]").head(5)))
Out[8]: 26891
```
This negatively affects dask dataframe operations that cut up pandas dataframes into small pieces, moves them around to different computers, and then pieces them back together again.
author:
url:https://github.com/mrocklin
type:Person
name:mrocklin
datePublished:2021-07-19T00:32:53.000Z
interactionStatistic:
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interactionType:https://schema.org/CommentAction
userInteractionCount:4
url:https://github.com/42600/pandas/issues/42600
Person:
url:https://github.com/mrocklin
name:mrocklin
url:https://github.com/mrocklin
name:mrocklin
InteractionCounter:
interactionType:https://schema.org/CommentAction
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