Matt McCline created HIVE-11981:
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Summary: ORC Schema Evolution Issues (Vectorized, ACID, and
Non-Vectorized)
Key: HIVE-11981
URL: https://issues.apache.org/jira/browse/HIVE-11981
Project: Hive
Issue Type: Bug
Components: Hive, Transactions
Reporter: Matt McCline
Assignee: Matt McCline
Priority: Critical
High priority issues with schema evolution for the ORC file format.
Schema evolution here is limited to adding new columns and a few cases of
column type-widening (e.g. int to bigint).
Renaming columns, deleting column, moving columns and other schema evolution
were not pursued due to lack of importance and lack of time. Also, it appears
a much more sophisticated metadata would be needed to support them.
The biggest issues for users have been adding new columns for ACID table
(HIVE-11421 Support Schema evolution for ACID tables) and vectorization
(HIVE-10598 Vectorization borks when column is added to table).
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