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https://issues.apache.org/jira/browse/HIVE-12236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15034577#comment-15034577
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Ashutosh Chauhan commented on HIVE-12236:
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I dont understand either the problem or proposed patch. Queries like {{select
*}} don't launch job anyway, which apparently [~gopalv] is trying to optimize
for. Patch AFAICT tries to extend optimization for {{select col_list }} queries
for which select expressions are deemed inexpensive, which [~hagleitn] seems to
suggest is not safe to do. Totally at loss here : ) Suggestions?
> LLAP: Prevent metadata queries from thrashing LLAP cache
> --------------------------------------------------------
>
> Key: HIVE-12236
> URL: https://issues.apache.org/jira/browse/HIVE-12236
> Project: Hive
> Issue Type: Improvement
> Components: Physical Optimizer
> Affects Versions: 1.3.0, 2.0.0
> Reporter: Gopal V
> Assignee: Gopal V
> Attachments: HIVE-12236.WIP.patch
>
>
> Currently, metadata queries fired by BI tools tend to thrash LLAP's cache.
> Bypass the cache and process metadata queries directly from HiveServer2
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