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https://issues.apache.org/jira/browse/DRILL-335?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aman Sinha reassigned DRILL-335:
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Assignee: Aman Sinha
> Implement hash aggregation operator for grouped aggregation
> -----------------------------------------------------------
>
> Key: DRILL-335
> URL: https://issues.apache.org/jira/browse/DRILL-335
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Aman Sinha
> Assignee: Aman Sinha
>
> Placeholder for doing design and implementation of hash based aggregation in
> Drill. Currently, it supports sort based aggregation. Hash aggregation
> involves building a hash table on the grouping columns and maintaining
> workspace for each of the aggregate functions in the query. This issue will
> focus on non-distinct aggregation for now (i.e aggregate function does not
> contain DISTINCT). A separate issue will be created to track distinct
> aggregation.
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