adriangb commented on code in PR #16642:
URL: https://github.com/apache/datafusion/pull/16642#discussion_r2182677781


##########
datafusion/physical-plan/src/filter_pushdown.rs:
##########
@@ -291,18 +136,8 @@ impl<T> FilterPushdownPropagation<T> {
         }
     }
 
-    /// Create a new [`FilterPushdownPropagation`] that tells the parent node
-    /// that none of the parent filters were not pushed down.
-    pub fn unsupported(parent_filters: Vec<Arc<dyn PhysicalExpr>>) -> Self {
-        let unsupported = PredicateSupports::all_unsupported(parent_filters);
-        Self {
-            filters: unsupported,
-            updated_node: None,
-        }
-    }
-
     /// Create a new [`FilterPushdownPropagation`] with the specified filter 
support.
-    pub fn with_filters(filters: PredicateSupports) -> Self {
+    pub fn with_filters(filters: Vec<PredicateSupport>) -> Self {

Review Comment:
   This is also mostly used in default implementations, I think it's unlikely 
actual implementers will write code like this (if you're implementing the 
methods you probably want to allow some filters through or all filters through 
hence `FilterPushdownPropagation::transparent`).



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