[jira] [Work logged] (BEAM-8794) Projects should be handled by an IOPushDownRule before applying AggregateProjectMergeRule

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-8794?focusedWorklogId=347013&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-347013 ]

ASF GitHub Bot logged work on BEAM-8794:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 20/Nov/19 21:29
            Start Date: 20/Nov/19 21:29
    Worklog Time Spent: 10m 
      Work Description: 11moon11 commented on issue #10180: [BEAM-8794] Conditional aggregate project merge
URL: https://github.com/apache/beam/pull/10180#issuecomment-556421814
 
 
   R: @apilloud 
   CC: @amaliujia 
 
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Issue Time Tracking
-------------------

            Worklog Id:     (was: 347013)
    Remaining Estimate: 0h
            Time Spent: 10m

> 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
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> 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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