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Posted to issues@arrow.apache.org by "Antoine Pitrou (JIRA)" <ji...@apache.org> on 2018/04/12 14:13:00 UTC
[jira] [Assigned] (ARROW-2450) [Python] Saving to parquet fails for empty lists
[ https://issues.apache.org/jira/browse/ARROW-2450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Antoine Pitrou reassigned ARROW-2450:
-------------------------------------
Assignee: Antoine Pitrou
> [Python] Saving to parquet fails for empty lists
> ------------------------------------------------
>
> Key: ARROW-2450
> URL: https://issues.apache.org/jira/browse/ARROW-2450
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Affects Versions: 0.9.0
> Reporter: Uwe L. Korn
> Assignee: Antoine Pitrou
> Priority: Major
> Fix For: 0.9.1
>
>
> When writing a table to parquet through pandas, if any column includes an empty list, it fails with a segmentation fault.
> Minimal example:
> {code}
> import pyarrow as pa
> import pyarrow.parquet as pq
> import pandas as pd
> def save(rows):
> table1 = pa.Table.from_pandas(pd.DataFrame(rows))
> pq.write_table(table1, 'test-foo.pq')
> table2 = pq.read_table('test-foo.pq')
> print('ROWS:', rows)
> print('TABLE1:', table1.to_pandas(), sep='\n')
> print('TABLE2:', table2.to_pandas(), sep='\n')
> save([{'val': ['something']}])
> print('---')
> save([{'val': []}]) # empty
> {code}
> Output:
> {code}
> ROWS: [{'val': ['something']}]
> TABLE1:
> val
> 0 [something]
> TABLE2:
> val
> 0 [something]
> ---
> ROWS: [{'val': []}]
> TABLE1:
> val
> 0 []
> [1] 13472 segmentation fault (core dumped) python3 test.py
> {code}
> Versions:
> {code}
> $ pip3 list | grep pyarrow
> pyarrow (0.9.0)
> $ python3 --version
> Python 3.5.2
> {code}
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