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https://issues.apache.org/jira/browse/TAJO-356?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyunsik Choi updated TAJO-356:
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Attachment: (was: TAJO-356_20140408_11:44:04.patch)
> 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
> Affects Versions: 0.8-incubating, 1.0-incubating
> Reporter: Hyunsik Choi
> Assignee: Hyunsik Choi
> Fix For: 0.8-incubating, 1.0-incubating
>
> Attachments: TAJO-356.patch
>
>
> 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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