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https://issues.apache.org/jira/browse/ARROW-4589?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Grove updated ARROW-4589:
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Summary: [Rust] [DataFusion] Implement projection push down query optimizer
rule (was: [Rust] [DataFusion] Aggregate query does not push down projection
to CSV file)
> [Rust] [DataFusion] Implement projection push down query optimizer rule
> -----------------------------------------------------------------------
>
> Key: ARROW-4589
> URL: https://issues.apache.org/jira/browse/ARROW-4589
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Rust - DataFusion
> Affects Versions: 0.12.0
> Reporter: Andy Grove
> Assignee: Andy Grove
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.13.0
>
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> If I run a query like the following:
> {code:java}
> SELECT MIN(fare_amount), MAX(fare_amount) FROM tripdata{code}
> I see this logical plan:
> {code:java}
> Logical plan: Aggregate: groupBy=[[]], aggr=[[MIN(#10), MAX(#10)]]
> TableScan: tripdata projection=None{code}
>
> This means that every column is being loaded into arrays rather than just the
> two columns that I care about, resulting in terrible performance.
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