marshauf commented on issue #6518:
URL:
https://github.com/apache/arrow-datafusion/issues/6518#issuecomment-1591067324
@alamb wouldn't it be possible to turn the SQL statement
```sql
SELECT call('localhost:3000', num, letter FROM (SELECT * FROM (VALUES (1,
'one'), (2, 'two'), (3, 'three')) AS t (num,letter))
```
into a LogicalPlan. Rewrite the Expr::ScalarUDF to a Expr::SubQuery with an
LogicalPlan::Extension.
The Extension would point to a custom ExecutionPlan, in which I could run
async code.
Similar to what is done in
[datafusion/core/tests/user_defined_plan.rs](https://github.com/apache/arrow-datafusion/blob/main/datafusion/core/tests/user_defined_plan.rs).
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