adriangb commented on code in PR #15685:
URL: https://github.com/apache/datafusion/pull/15685#discussion_r2040466799


##########
datafusion/physical-expr/src/expressions/dynamic_filters.rs:
##########
@@ -335,22 +313,12 @@ mod test {
         ]));
         // Each ParquetExec calls `with_new_children` on the 
DynamicFilterPhysicalExpr
         // and remaps the children to the file schema.
-        let dynamic_filter_1 = reassign_predicate_columns(
-            Arc::clone(&dynamic_filter) as Arc<dyn PhysicalExpr>,
-            &filter_schema_1,
-            false,
-        )
-        .unwrap();
-        let snap = dynamic_filter_1.snapshot().unwrap().unwrap();
-        insta::assert_snapshot!(format!("{snap:?}"), @r#"BinaryExpr { left: 
Column { name: "a", index: 0 }, op: Eq, right: Literal { value: Int32(42) }, 
fail_on_overflow: false }"#);
-        let dynamic_filter_2 = reassign_predicate_columns(
-            Arc::clone(&dynamic_filter) as Arc<dyn PhysicalExpr>,
-            &filter_schema_2,
-            false,
-        )
-        .unwrap();
-        let snap = dynamic_filter_2.snapshot().unwrap().unwrap();
-        insta::assert_snapshot!(format!("{snap:?}"), @r#"BinaryExpr { left: 
Column { name: "a", index: 1 }, op: Eq, right: Literal { value: Int32(42) }, 
fail_on_overflow: false }"#);
+        let dynamic_filter_1 = 
dynamic_filter.with_schema(Arc::clone(&filter_schema_1));
+        let snap_1 = dynamic_filter_1.snapshot().unwrap().unwrap();
+        insta::assert_snapshot!(format!("{snap_1:?}"), @r#"BinaryExpr { left: 
Column { name: "a", index: 0 }, op: Eq, right: Literal { value: Int32(42) }, 
fail_on_overflow: false }"#);
+        let dynamic_filter_2 = 
dynamic_filter.with_schema(Arc::clone(&filter_schema_2));

Review Comment:
   Right but the constraint is that we can't modify what 
`reassign_predicate_columns` and similar do internally, otherwise that's a ton 
of API churn. The existing design works within the confines of the existing 
APIs.



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