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https://issues.apache.org/jira/browse/TAJO-973?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyoungjun Kim reassigned TAJO-973:
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Assignee: (was: Hyoungjun Kim)
> DISTINCT should support SortAggregation in first stage.
> -------------------------------------------------------
>
> Key: TAJO-973
> URL: https://issues.apache.org/jira/browse/TAJO-973
> Project: Tajo
> Issue Type: Improvement
> Reporter: Hyoungjun Kim
> Priority: Minor
>
> Currently Tajo only support HashAggregation in first stage in the case of
> DISTINCT. If a task for first stage has many records, OutOfMemory occurs.
> Tajo should support SortAggregation.
> Tajo does not know what the algorithm should choose in the first stage. And
> Tajo does not support query hint clause. So I will add
> "tajo-distinct-first-stage-algorithm" property in the TajoConf. After
> TAJO-928 that property can be set in session variable.
>
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