adriangb commented on code in PR #15685:
URL: https://github.com/apache/datafusion/pull/15685#discussion_r2039623779


##########
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:
   What is expected to call `with_schema`? This seems like a new method on 
`DynamicFilterPhysicalExpr`. We need `reassign_predicate_columns` to work, 
that's what gets called from within `ParquetSource`, etc.



##########
datafusion/physical-expr/src/expressions/dynamic_filters.rs:
##########
@@ -159,35 +139,13 @@ impl DynamicFilterPhysicalExpr {
                 )
             })?
             .clone();
-        let inner =
-            Self::remap_children(&self.children, 
self.remapped_children.as_ref(), inner)?;

Review Comment:
   This means that `evaluate` no longer uses a version with remapped children 
right?



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