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https://issues.apache.org/jira/browse/ORC-1813?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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suyiteng reassigned ORC-1813:
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> Incompatibility with ORC files written in version 0.12 due to missing hasNull
> field in C++ Reader
> -------------------------------------------------------------------------------------------------
>
> Key: ORC-1813
> URL: https://issues.apache.org/jira/browse/ORC-1813
> Project: ORC
> Issue Type: Bug
> Components: C++
> Affects Versions: 2.0.3
> Reporter: suyiteng
> Assignee: suyiteng
> Priority: Critical
>
> We encountered an issue with the C++ implementation of the ORC reader when
> handling ORC files written with version 0.12. Specifically, files written in
> this version do not include the hasNull field in the column statistics
> metadata. While the Java implementation of the ORC reader handles this
> gracefully by defaulting hasNull to true when the field is absent, the C++
> implementation does not handle this scenario correctly.
> *This issue prevents predicates like IS NULL from being pushed down to the
> ORC reader!!! As a result, all rows in the file are filtered out, leading to
> incorrect query results :(*
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