Sergey Shelukhin created HIVE-12631:
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Summary: LLAP: support ORC ACID tables
Key: HIVE-12631
URL: https://issues.apache.org/jira/browse/HIVE-12631
Project: Hive
Issue Type: Bug
Reporter: Sergey Shelukhin
LLAP uses a completely separate read path in ORC to allow for caching and
parallelization of reads and processing. This path does not support ACID. As
far as I remember ACID logic is embedded inside ORC format; we need to refactor
it to be on top of some interface, if practical; or just port it to LLAP read
path.
Another consideration is how the logic will work with cache. The cache is
currently low-level (CB-level in ORC), so we could just use it to read bases
and deltas (deltas should be cached with higher priority) and merge as usual.
We could also cache merged representation in future.
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