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Posted to issues@arrow.apache.org by "ParthivNaresh (via GitHub)" <gi...@apache.org> on 2023/02/07 13:21:38 UTC
[GitHub] [arrow] ParthivNaresh opened a new issue, #34070: BUG: mode() throws an error for a series with string[pyarrow] dtype
ParthivNaresh opened a new issue, #34070:
URL: https://github.com/apache/arrow/issues/34070
### Describe the bug, including details regarding any error messages, version, and platform.
```python
import pandas as pd
series = pd.Series(["red", "yellow", "red", "green", pd.NA], dtype="string[pyarrow]")
series.mode()
=======================================
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File ".../pandas/core/series.py", line 2072, in mode
res_values = values._mode(dropna=dropna)
File ".../pandas/core/arrays/arrow/array.py", line 1311, in _mode
modes = pc.mode(data, pc.count_distinct(data).as_py())
File ".../pyarrow/compute.py", line 255, in wrapper
return func.call(args, options, memory_pool)
File "pyarrow/_compute.pyx", line 355, in pyarrow._compute.Function.call
File "pyarrow/error.pxi", line 144, in pyarrow.lib.pyarrow_internal_check_status
File "pyarrow/error.pxi", line 121, in pyarrow.lib.check_status
pyarrow.lib.ArrowNotImplementedError: Function 'mode' has no kernel matching input types (string)
```
Using the `string[pyarrow]` dtype prevents the usage of `mode()`.
pandas : 2.0.0.dev0+1430.gb2a26ecc5
numpy : 1.23.4
pyarrow : 9.0.0
### Component(s)
Python
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Re: [I] [C++] Implement "mode" kernel for string (binary) types [arrow]
Posted by "thisisnic (via GitHub)" <gi...@apache.org>.
thisisnic closed issue #34070: [C++] Implement "mode" kernel for string (binary) types
URL: https://github.com/apache/arrow/issues/34070
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[GitHub] [arrow] jorisvandenbossche commented on issue #34070: [C++] Implement "mode" kernel for string (binary) types
Posted by "jorisvandenbossche (via GitHub)" <gi...@apache.org>.
jorisvandenbossche commented on issue #34070:
URL: https://github.com/apache/arrow/issues/34070#issuecomment-1420990765
@ParthivNaresh I re-framed your report to an enhancement request to add support to the "mode" kernel for string data. Given that string data can be sorted and compared, it seems it can make sense to also support the "mode" operation.
If you want support for this on the shorter term in pandas, you might want to report the issue to the pandas issue tracker instead (they could potentially work around the lack of "mode" support for now).
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Re: [I] [C++] Implement "mode" kernel for string (binary) types [arrow]
Posted by "thisisnic (via GitHub)" <gi...@apache.org>.
thisisnic commented on issue #34070:
URL: https://github.com/apache/arrow/issues/34070#issuecomment-3921683425
This issue has been marked as stale because it has had no activity in the past 2 years. Please remove the stale label or comment below, or this issue will be closed in 14 days.
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