[jira] [Created] (ARROW-4589) [Rust] [DataFusion] Aggregate query does not push down projection to CSV file

["Andy Grove (JIRA)" <ji...@apache.org>]

Andy Grove created ARROW-4589:
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             Summary: [Rust] [DataFusion] Aggregate query does not push down projection to CSV file
                 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
             Fix For: 0.13.0


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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