Aman Sinha created DRILL-361:
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Summary: Optimization for aggregation functions workspace
Key: DRILL-361
URL: https://issues.apache.org/jira/browse/DRILL-361
Project: Apache Drill
Issue Type: Bug
Reporter: Aman Sinha
Currently, when an aggregation operator populates its outgoing record batch, it
goes through the value vectors in its workspace and produces the output value..
for instance if the aggregate was AVG, the aggregate function workspace
variables are sum and count, and we compute the sum/count to populate the
output record. However, this is sub-optimal for the case where the aggregate
function is simply doing a SUM or COUNT etc. In those cases, we should be able
to directly transfer the entire workspace value vector to the outgoing batch
and get better performance. We could maintain some property in the aggregate
function itself that indicates whether it is a candidate for such an operation.
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