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https://issues.apache.org/jira/browse/ARROW-2121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16358990#comment-16358990
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ASF GitHub Bot commented on ARROW-2121:
---------------------------------------
robertnishihara commented on issue #1581: ARROW-2121: [Python] Handle object
arrays directly in pandas serializer.
URL: https://github.com/apache/arrow/pull/1581#issuecomment-364573786
Some performance numbers. The numbers are somewhat variable if you run the
benchmarks multiple times.
```python
import pyarrow as pa
import pandas as pd
df = pd.DataFrame(data={str(i): [i, str(i)] for i in range(10 ** 6)})
```
Before this PR
```python
context = pa.pandas_serialization_context()
%time s = pa.serialize(df, context=context).to_buffer() # 570ms
%time d = pa.deserialize(s, context=context) # 485ms
%timeit s = pa.serialize(df, context=context).to_buffer() # 482ms
%timeit d = pa.deserialize(s, context=context) # 376ms
```
After this PR
```python
%time s = pa.serialize(df).to_buffer() # 577ms
%time d = pa.deserialize(s) # 672ms
%timeit s = pa.serialize(df).to_buffer() # 467ms
%timeit d = pa.deserialize(s) # 349ms
```
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> Consider special casing object arrays in pandas serializers.
> ------------------------------------------------------------
>
> Key: ARROW-2121
> URL: https://issues.apache.org/jira/browse/ARROW-2121
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Reporter: Robert Nishihara
> Priority: Major
> Labels: pull-request-available
>
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