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https://issues.apache.org/jira/browse/ARROW-11117?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ying Zhou closed ARROW-11117.
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> [C++] ORC Reader uses wrong types
> ---------------------------------
>
> Key: ARROW-11117
> URL: https://issues.apache.org/jira/browse/ARROW-11117
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Ying Zhou
> Assignee: Ying Zhou
> Priority: Major
> Labels: orc
> Original Estimate: 672h
> Remaining Estimate: 672h
>
> The Arrow C++ ORC reader does not process types correctly. In particular it
> does the following:
> 1. It converts the ORC STRING type to the Arrow STRING type despite the fact
> that all ORC STRINGs are large.
> 2. It converts the ORC LIST type to the Arrow LIST type despite the fact that
> all ORC LISTs are large.
> 3. It converts the ORC MAP type to LISTS of STRUCTS with hardcoded field
> names while an actual MAP type exists in Arrow (note that the ORC MAPs are
> large so we need to filter out large ones when converting).
> These issues need to be fixed.
>
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