[jira] [Updated] (ARROW-2406) [Python] Segfault when creating PyArrow table from Pandas for empty string column when schema provided

["Dave Challis (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-2406?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dave Challis updated ARROW-2406:
--------------------------------
    Description: 
Minimal example to recreate:
{code}
import pandas as pd
import pyarrow as pa

df = pd.DataFrame({'a': []})
df['a'] = df['a'].astype(str)
schema = pa.schema([pa.field('a', pa.string())])
pa.Table.from_pandas(df, schema=schema){code}
 

This causes the python interpreter to exit with "Segmentation fault: 11".

The following examples all work without any issue:
{code}
# column 'a' is no longer empty
df = pd.DataFrame({'a': ['foo']})
df['a'] = df['a'].astype(str)
schema = pa.schema([pa.field('a', pa.string())])
pa.Table.from_pandas(df, schema=schema)
{code}
{code}
# column 'a' is empty, but no schema is specified
df = pd.DataFrame({'a': []})
df['a'] = df['a'].astype(str)
pa.Table.from_pandas(df)
{code}
 

  was:
Minimal example to recreate:

 

 
{code:python}
import pandas as pd
import pyarrow as pa

df = pd.DataFrame({'a': []})
df['a'] = df['a'].astype(str)
schema = pa.schema([pa.field('a', pa.string())])
pa.Table.from_pandas(df, schema=schema){code}
 

This causes the python interpreter to exit with "Segmentation fault: 11".

The following examples all work without any issue:
{code:python}
# column 'a' is no longer empty
df = pd.DataFrame({'a': ['foo']})
df['a'] = df['a'].astype(str)
schema = pa.schema([pa.field('a', pa.string())])
pa.Table.from_pandas(df, schema=schema)
{code}

{code:python}
# column 'a' is empty, but no schema is specified
df = pd.DataFrame({'a': []})
df['a'] = df['a'].astype(str)
pa.Table.from_pandas(df)
{code}


 


> [Python] Segfault when creating PyArrow table from Pandas for empty string column when schema provided
> ------------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-2406
>                 URL: https://issues.apache.org/jira/browse/ARROW-2406
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 0.9.0
>         Environment: Mac OS High Sierra
> Python 3.6.3
>            Reporter: Dave Challis
>            Priority: Major
>
> Minimal example to recreate:
> {code}
> import pandas as pd
> import pyarrow as pa
> df = pd.DataFrame({'a': []})
> df['a'] = df['a'].astype(str)
> schema = pa.schema([pa.field('a', pa.string())])
> pa.Table.from_pandas(df, schema=schema){code}
>  
> This causes the python interpreter to exit with "Segmentation fault: 11".
> The following examples all work without any issue:
> {code}
> # column 'a' is no longer empty
> df = pd.DataFrame({'a': ['foo']})
> df['a'] = df['a'].astype(str)
> schema = pa.schema([pa.field('a', pa.string())])
> pa.Table.from_pandas(df, schema=schema)
> {code}
> {code}
> # column 'a' is empty, but no schema is specified
> df = pd.DataFrame({'a': []})
> df['a'] = df['a'].astype(str)
> pa.Table.from_pandas(df)
> {code}
>  



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