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https://issues.apache.org/jira/browse/ARROW-8282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17072178#comment-17072178
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Francois Saint-Jacques commented on ARROW-8282:
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Once we have instanciated Fragment, we can create a CastFragment composing an
existing Fragment. Some format do support casting, e.g. CSV, and some don't
e.g. Parquet or IPC.
> [C++/Python][Dataset] Support schema evolution for integer columns
> ------------------------------------------------------------------
>
> Key: ARROW-8282
> URL: https://issues.apache.org/jira/browse/ARROW-8282
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++ - Dataset
> Reporter: Uwe Korn
> Priority: Major
>
> When reading in a dataset where the schema specifies that column X is of type
> {{int64}} but the partition actually contains the data stored in that columns
> as {{int32}}, an upcast should be done.
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