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https://issues.apache.org/jira/browse/PARQUET-1867?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gang Wu resolved PARQUET-1867.
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Resolution: Won't Fix
This is by design and a warning has been added long ago:
[arrow/cpp/src/parquet/metadata.h at 37bd413c8322e0d9527c14420468b99f8abd1715 ยท
apache/arrow
(github.com)|https://github.com/apache/arrow/blob/37bd413c8322e0d9527c14420468b99f8abd1715/cpp/src/parquet/metadata.h#L322]
> [C++] Fix MetaData children object lifetime issues
> --------------------------------------------------
>
> Key: PARQUET-1867
> URL: https://issues.apache.org/jira/browse/PARQUET-1867
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-cpp
> Reporter: Francois Saint-Jacques
> Priority: Major
>
> FileMetaData::RowGroup(int i) and RowGroupMetaData::ColumnChunk(i) returns
> both a unique_ptr<T> which gives the impression that the object are
> self-contained and safe to own without any lifetime issue.
> The reality is that the caller must hold the lifetime of the parent object.
> We should change the signature to a const-ref instead.
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