jayzhan211 commented on code in PR #15685:
URL: https://github.com/apache/datafusion/pull/15685#discussion_r2040505924


##########
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:
   If you really want to keep `reassign_predicate_columns` for whatever reason, 
you should pass the `inner` of `DynamicFilterPhysicalExpr` instead, so you are 
only modifying the `inner` and not the whole `DynamicFilterPhysicalExpr`. The 
difference is that the `with_new_children` is not called on the 
`DynamicFilterPhysicalExpr` level.



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