[
https://issues.apache.org/jira/browse/ARROW-1992?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Victor Uriarte updated ARROW-1992:
----------------------------------
Description:
When trying to read back a table, Python crashes when pyarrow is used to
read/convert a table that has a column of 0 length `strings and
strings_to_categorical=True`. Example code below.
This same test ran ok with pyarrow 0.7.1
{code:none}
import pandas as pd
import pyarrow as pa
df = pd.DataFrame({
'Foo': ['A', 'A', 'B', 'B', 'C'],
'Bar': ['A1', 'A2', 'B2', 'D3', ''],
'Baz': ['', '', '', '', ''],
})
table = pa.Table.from_pandas(df)
df = table.to_pandas(strings_to_categorical=False) # Works
print('Categoricals=False', len(df))
df = table.to_pandas(strings_to_categorical=True) # Crashes
print('Categoricals=True', len(df))
{code}
was:
When trying to read back a table, Python crashes when pyarrow is used to
read/convert a table that has a column of 0 length `strings and
strings_to_categorical=True`. Example code below.
This same test ran ok with pyarrow 0.7.1
{code:python}
import pathlib
import pandas as pd
import pyarrow as pa
import pyarrow.parquet as pq
df = pd.DataFrame({
'Foo': ['A', 'A', 'B', 'B', 'C'],
'Bar': ['A1', 'A2', 'B2', 'D3', ''],
'Baz': ['', '', '', '', ''],
})
test_dir = pathlib.Path(__file__).parent / 'test_bug'
test_dir.mkdir(parents=True, exist_ok=True)
table = pa.Table.from_pandas(df)
path = test_dir / 'file1.parquet'
path = str(path) # write_table doesn't support `pathlib.Path` objects
pq.write_table(table, path)
path = test_dir / 'file2.parquet'
path = str(path) # write_table doesn't support `pathlib.Path` objects
pq.write_table(table, path)
path = str(test_dir) # write_table doesn't support `pathlib.Path` objects
data_set = pq.ParquetDataset(path)
table = data_set.read()
df2 = table.to_pandas(strings_to_categorical=True)
print(len(df2))
{code}
> to_pandas crashes when using strings_to_categoricals on empty string cols on
> 0.8.0
> ----------------------------------------------------------------------------------
>
> Key: ARROW-1992
> URL: https://issues.apache.org/jira/browse/ARROW-1992
> Project: Apache Arrow
> Issue Type: Bug
> Affects Versions: 0.8.0
> Environment: OS: Windows
> Python: PY36 x64
> Pandas: 0.22.0
> pyarrow: 0.8.0
> Reporter: Victor Uriarte
> Fix For: 0.7.1
>
>
> When trying to read back a table, Python crashes when pyarrow is used to
> read/convert a table that has a column of 0 length `strings and
> strings_to_categorical=True`. Example code below.
> This same test ran ok with pyarrow 0.7.1
> {code:none}
> import pandas as pd
> import pyarrow as pa
> df = pd.DataFrame({
> 'Foo': ['A', 'A', 'B', 'B', 'C'],
> 'Bar': ['A1', 'A2', 'B2', 'D3', ''],
> 'Baz': ['', '', '', '', ''],
> })
> table = pa.Table.from_pandas(df)
> df = table.to_pandas(strings_to_categorical=False) # Works
> print('Categoricals=False', len(df))
> df = table.to_pandas(strings_to_categorical=True) # Crashes
> print('Categoricals=True', len(df))
> {code}
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