You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@arrow.apache.org by "Florian Jetter (JIRA)" <ji...@apache.org> on 2017/08/03 15:33:00 UTC
[jira] [Created] (ARROW-1328) [Python] pyarrow.Table.from_pandas
option timestamps_to_ms changes column values
Florian Jetter created ARROW-1328:
-------------------------------------
Summary: [Python] pyarrow.Table.from_pandas option timestamps_to_ms changes column values
Key: ARROW-1328
URL: https://issues.apache.org/jira/browse/ARROW-1328
Project: Apache Arrow
Issue Type: Bug
Components: Python
Affects Versions: 0.5.0
Environment: MacOS 10.12.6
python 2.7.12
pyarrow==0.5.0
pandas==0.20.3
numpy==1.13.1
python-dateutil==2.6.1
Reporter: Florian Jetter
The {{pyarrow.Table.from_pandas}} option {{timestamps_to_ms}} changes the value of the datetime column
{code:none}
>>> import pyarrow as pa
>>> import pandas as pd
>>> from datetime import datetime
>>>
>>> df = pd.DataFrame({'datetime': [datetime(2017, 1, 1)]})
>>> dtype = df['datetime'].dtype
>>> pa_type = pa.from_numpy_dtype(dtype)
>>> schema = pa.schema([pa.field('datetime', pa_type)])
>>> table = pa.Table.from_pandas(df=df, schema=schema, timestamps_to_ms=True)
>>> table.to_pandas()
datetime
0 1970-01-01 00:24:43.228800
>>> dtype
dtype('<M8[ns]')
>>> pa_type
TimestampType(timestamp[ns])
{code}
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)