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https://issues.apache.org/jira/browse/ARROW-4267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17661291#comment-17661291
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Rok Mihevc commented on ARROW-4267:
-----------------------------------
This issue has been migrated to [issue
#15939|https://github.com/apache/arrow/issues/15939] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [Python/C++][Parquet] 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
> Components: C++
> Affects Versions: 0.11.1
> Reporter: Florian Jetter
> Assignee: Uwe Korn
> Priority: Minor
> Labels: parquet, pull-request-available
> Fix For: 0.12.1, 0.13.0
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> 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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