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https://issues.apache.org/jira/browse/HIVE-7189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15235823#comment-15235823
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Eric Sun commented on HIVE-7189:
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A temporary solution is to use org.apache.hive.hcatalog.pig.HCatLoader()
instead of OrcStorage(). But it will be great to store the real field names in
ORC data files.
* the field names inside nested structures are preserved even if we generate
the ORC via Hive
> Hive does not store column names in ORC
> ---------------------------------------
>
> Key: HIVE-7189
> URL: https://issues.apache.org/jira/browse/HIVE-7189
> Project: Hive
> Issue Type: Bug
> Components: File Formats, ORC
> Affects Versions: 0.12.0, 0.13.0
> Reporter: Chris Drome
> Assignee: Daniel Dai
>
> We uncovered the following discrepancy between writing ORC files through Pig
> and Hive:
> ORCFile header contains the name of the columns. Storing through Pig
> (ORCStorage or HCatStorer), the column names are stored fine. But when stored
> through hive they are stored as _col0, _col1,....,_col99 and hive uses the
> partition schema to map the column names. Reading the same file through Pig
> then has problems as user will have to manually map columns.
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