[jira] [Created] (TAJO-1136) Implement queryable virtual table for query history

["Hyunsik Choi (JIRA)" <ji...@apache.org>]

Hyunsik Choi created TAJO-1136:
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             Summary: Implement queryable virtual table for query history
                 Key: TAJO-1136
                 URL: https://issues.apache.org/jira/browse/TAJO-1136
             Project: Tajo
          Issue Type: New Feature
          Components: tajo master
            Reporter: Hyunsik Choi


Currently, Tajo does not provide queryable query history. We can see the history form WEB UI or {{bin/tajo}} command.

I propose that we should implement a virtual table where each row a running/finished/failed query and columns are query id, start time, finish time, query status, in/out bytes and other counts and statistic information.

If we provide queryable feature for query history, we don't need to implement additional code to discovery queries. Especially, it would be very useful for following cases:
 * users can get some statistic information for their usages
 * Query optimizer can exploit statistic information



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