Aman Sinha created DRILL-335:
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Summary: 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
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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