pitrou commented on code in PR #48742:
URL: https://github.com/apache/arrow/pull/48742#discussion_r2672272966


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cpp/src/arrow/csv/reader.cc:
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Review Comment:
   > But why the changes to the `options_` ownership? It doesn't have to 
out-live `self`, does it?
   
   It does, because the ColumnBuilder can schedule its own tasks without owning 
the table reader:
   
https://github.com/apache/arrow/blob/fe5e0e5eec6ff644879e4371d83ce130e475b8f1/cpp/src/arrow/csv/column_builder.cc#L259-L261
   



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