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Posted to dev@hive.apache.org by "Sergey Shelukhin (JIRA)" <ji...@apache.org> on 2013/08/29 23:29:51 UTC

[jira] [Created] (HIVE-5171) metastore server can cache pruning results across queries

Sergey Shelukhin created HIVE-5171:
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             Summary: metastore server can cache pruning results across queries 
                 Key: HIVE-5171
                 URL: https://issues.apache.org/jira/browse/HIVE-5171
             Project: Hive
          Issue Type: Improvement
            Reporter: Sergey Shelukhin
            Assignee: Sergey Shelukhin


Partition pruning results are cached during a query (SemanticAnalyzer and ParseContext are the scope). 
We could also cache them between queries in MetaStore, which would be especially useful if metastore server is remote and thus long-lived/shared between clients.

It may be more complex than it seems due to OOM potential. Also the key would need to be changed since the same expression string that is currently used may mean different things for different queries.

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