alamb commented on code in PR #4878:
URL: https://github.com/apache/arrow-datafusion/pull/4878#discussion_r1068729877
##########
datafusion/core/src/physical_optimizer/dist_enforcement.rs:
##########
@@ -431,9 +431,22 @@ fn reorder_aggregate_keys(
None
};
if let Some(partial_agg) = new_partial_agg {
+ // Build new group expressions that correspond to the
schema of partial_agg
let mut new_group_exprs = vec![];
- for idx in positions.into_iter() {
- new_group_exprs.push(group_by.expr()[idx].clone());
+ for (idx, position) in positions.into_iter().enumerate() {
+ let (group_expr, name) =
group_by.expr()[position].clone();
+
+ // Update the index of columns so that they correspond
to the schema of partial_agg
+ // rather than input_schema.
+ let group_expr = if let Some(group_col) =
+ group_expr.as_any().downcast_ref::<Column>()
+ {
+ Arc::new(Column::new(group_col.name(), idx))
+ as Arc<dyn PhysicalExpr>
Review Comment:
I think you can do something like this to get the rust compiler to do the
right cast for you:
```suggestion
as _
```
However the rest of this module is in the same `as Arc<...>` style so no
need to change it in this PR
##########
datafusion/core/tests/sql/joins.rs:
##########
@@ -2810,3 +2810,61 @@ async fn type_coercion_join_with_filter_and_equi_expr()
-> Result<()> {
Ok(())
}
+
+#[tokio::test]
+async fn test_cross_join_to_groupby_with_different_key_ordering() ->
Result<()> {
Review Comment:
I verified that this test does indeed panic without the test code
```
---- sql::joins::test_cross_join_to_groupby_with_different_key_ordering
stdout ----
thread 'sql::joins::test_cross_join_to_groupby_with_different_key_ordering'
panicked at 'called `Option::unwrap()` on a `None` value',
datafusion/core/src/physical_plan/joins/hash_join.rs:923:17
stack backtrace:
```
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