adriangb commented on code in PR #15801:
URL: https://github.com/apache/datafusion/pull/15801#discussion_r2073150977


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datafusion/physical-plan/src/filter_pushdown.rs:
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@@ -191,6 +191,7 @@ impl<T> FilterPushdownPropagation<T> {
 
 #[derive(Debug, Clone)]
 pub struct FilterDescription {
+    num_children: usize,

Review Comment:
   Yes sorry forgot to implement it but my thought was that you pass in the 
size to `new()` and then if you add filters you're forced to either add the 
right number (one per child) or use the broadcast helper functions. I want to 
make it error if you do e.g. 
`FilterDescription::new(1).with_parent_filters(vec![vec![predicate], 
vec![predicate]])`. I've implemented an internal refactor.



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