Kirill Kozlov created BEAM-8794:
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Summary: Projects should be handled by an IOPushDownRule before
applying AggregateProjectMergeRule
Key: BEAM-8794
URL: https://issues.apache.org/jira/browse/BEAM-8794
Project: Beam
Issue Type: Improvement
Components: dsl-sql
Reporter: Kirill Kozlov
Assignee: Kirill Kozlov
It is more efficient to push-down projected fields at an IO level (vs merging
with an Aggregate), when supported.
When running queries like:
{code:java}
select SUM(score) as total_score from <TABLE> group by name{code}
Projects get merged with an aggregate, as a result Calc (after an IOSourceRel)
projects all fields and BeamIOPushDown rule does know what fields can be
dropped, thus not dropping any.
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