[HIVE-7189] Hive does not store column names in ORC

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 0.12.0, 0.13.0
• Component/s: File Formats, ORC
• Tags: orc orcstorage hcatstorer
• Assignee: Daniel Dai
• Reporter: Chris Drome
• Created: 06/Jun/14 20:54
• Updated: 11/Apr/16 20:14

Description

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.