neilconway opened a new issue, #21324:
URL: https://github.com/apache/datafusion/issues/21324
### Describe the bug
Example query (TPC-H Q22):
```sql
SELECT ... FROM customer
WHERE c_acctbal > (SELECT avg(c_acctbal) FROM customer WHERE ...)
```
It would be good to push the predicate down to the scan on `customer`.
The problem with doing this now is that `filter_partitions` calls
`create_physical_expr` with a fresh `ExecutionProps`, so we don't have a way to
pass the `ScalarSubqueryResults` to any `ScalarSubqueryExpr` nodes in the
filter expression. This should be fixable in theory.
We'd also need to update `extract_dml_filters` to apply subquery filters.
This is distinct from using subquery filters for partition pruning, which
would be more difficult (we'd need to evaluate the subquery at planning-time).
### To Reproduce
_No response_
### Expected behavior
_No response_
### Additional context
_No response_
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