mustafasrepo opened a new issue, #6190:
URL: https://github.com/apache/arrow-datafusion/issues/6190
### Is your feature request related to a problem or challenge?
Consider the query below
```sql
SELECT s.sn, s.amount
FROM sales_global AS s
GROUP BY sn
```
When `sn` is `PRIMARY KEY` we know that, all the columns the table
`sales_global` e.g `s` can be emitted after aggregation (since they will all
have same values). Corresponding query can run in Postgre. However, datafusion
can only emit `s.sn` after aggregation from the original table.
### Describe the solution you'd like
I would like to have this support.
### Describe alternatives you've considered
_No response_
### Additional context
To reproduce the problem one can use the test below
```rust
#[tokio::test]
async fn test_primary_key_aggregation() -> Result<()> {
let config = SessionConfig::new()
.with_target_partitions(1);
let ctx = SessionContext::with_config(config);
ctx.sql("CREATE TABLE sales_global (
sn INT PRIMARY KEY,
ts TIMESTAMP,
currency VARCHAR(3),
amount INT
) as VALUES
(1, '2022-01-01 08:00:00'::timestamp, 'EUR', 50.00),
(2, '2022-01-01 11:30:00'::timestamp, 'EUR', 75.00),
(3, '2022-01-02 12:00:00'::timestamp, 'EUR', 200.00),
(4, '2022-01-03 10:00:00'::timestamp, 'EUR', 100.00)").await?;
let sql = "SELECT s.sn, s.amount
FROM sales_global AS s
GROUP BY sn";
let msg = format!("Creating logical plan for '{sql}'");
let dataframe: DataFrame = ctx.sql(sql).await.expect(&msg);
let physical_plan = dataframe.create_physical_plan().await?;
let batches = collect(physical_plan, ctx.task_ctx()).await?;
print_batches(&batches)?;
Ok(())
}
```
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