[jira] [Created] (TAJO-356) Improve TajoClient to directly get query results in the first request

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

Hyunsik Choi created TAJO-356:
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             Summary: Improve TajoClient to directly get query results in the first request
                 Key: TAJO-356
                 URL: https://issues.apache.org/jira/browse/TAJO-356
             Project: Tajo
          Issue Type: Improvement
          Components: client
            Reporter: Hyunsik Choi
            Assignee: Hyunsik Choi
             Fix For: 0.8-incubating


Currently, TajoClient cannot deal with simple queries (e.g., select * from table limit 1 or select 1) which are executed in TajoMaster without distributed execution. The final results are always stored in HDFS, and TajoClient gets the result via scanner with TableDesc obtained from GetQueryResultResponse. 

For simple queries directly executed at TajoMaster, TajoClient needs to directly get some binary serialized rows results from GetQueryStatusResponse or GetQueryResultResponse instead of reading materialized tables.

This feature would be also useful for low latency queries, EXPLAIN clauses and  expr-only statements without FROM clause.



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