jorisvandenbossche opened a new pull request, #40721:
URL: https://github.com/apache/arrow/pull/40721
### Rationale for this change
The `pandas_compat.py` has over the years grown quite complex and a lot of
pandas compatibility code, which probably can be simplified nowadays because of
not supporting old pandas and Python versions anymore.
One part of the code where this is the case is in the reconstruction of the
`.columns` Index object of the resulting DataFrame. Right now that always goes
through a MultiIndex (even for simple column names), which has quite some
overhead of the simple case. And it also has some old Python/pandas compat code
that could be removed.
### What changes are included in this PR?
The simplification to not go through a MultiIndex for the simple cases gives
a nice speed-up as well:
```python
In [1]: table = pa.table({'a': [1, 2, 3], 'b': [0.1, 0.2, 0.3], 'c': [3, 4,
5]})
In [2]: %timeit table.to_pandas()
251 µs ± 1.26 µs per loop (mean ± std. dev. of 7 runs, 1,000 loops each) #
<-- main
68.1 µs ± 894 ns per loop (mean ± std. dev. of 7 runs, 10,000 loops each) #
<-- PR
```
### Are these changes tested?
We should have extensive existing tests for this
### Are there any user-facing changes?
That should not be the case
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
