[jira] [Commented] (ARROW-4267) [Python/C++] Segfault when reading rowgroups with duplicated columns

["Wes McKinney (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-4267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16763316#comment-16763316 ] 

Wes McKinney commented on ARROW-4267:
-------------------------------------

can you submit a PR?

> [Python/C++] Segfault when reading rowgroups with duplicated columns
> --------------------------------------------------------------------
>
>                 Key: ARROW-4267
>                 URL: https://issues.apache.org/jira/browse/ARROW-4267
>             Project: Apache Arrow
>          Issue Type: Bug
>    Affects Versions: 0.11.1
>            Reporter: Florian Jetter
>            Priority: Minor
>             Fix For: 0.14.0
>
>
> When reading a row group using duplicated columns I receive a segfault.
> {code:python}
> import pandas as pd
> import pyarrow as pa
> import pyarrow.parquet as pq
> df = pd.DataFrame({
> "col": ["A", "B"]
> })
> table = pa.Table.from_pandas(df)
> buf = pa.BufferOutputStream()
> pq.write_table(table, buf)
> parquet_file = pq.ParquetFile(buf.getvalue())
> parquet_file.read_row_group(0)
> parquet_file.read_row_group(0, columns=["col"])
> # boom
> parquet_file.read_row_group(0, columns=["col", "col"])
> {code}



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