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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