Sergey Shelukhin created HIVE-12023:
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Summary: add option to explain optimizer(s) behavior
Key: HIVE-12023
URL: https://issues.apache.org/jira/browse/HIVE-12023
Project: Hive
Issue Type: Bug
Reporter: Sergey Shelukhin
This is just a brain dump based on my on call week and previous experience.
I want to be able to see why parts of query are not vectorized, why CBO didn't
apply, why LLAP is not used, and other such stuff, without digging thru logs.
It should probably be part of explain, or a separate type of explain since it
doesn't fit very well with how explain works right now (it describes the end
result, not the process - one could work around it by storing messages in
fields, but that would not be very pretty).
Maybe we can add EXPLAIN OPTIMIZERS and add some context for optimizers to dump
messages for this case. Or something.
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