LLDay commented on code in PR #20009:
URL: https://github.com/apache/datafusion/pull/20009#discussion_r2758278123


##########
datafusion/physical-plan/src/joins/hash_join/exec.rs:
##########
@@ -1384,6 +1386,55 @@ impl ExecutionPlan for HashJoinExec {
         }
         Ok(result)
     }
+
+    fn physical_expressions<'a>(
+        &'a self,
+    ) -> Option<Box<dyn Iterator<Item = Arc<dyn PhysicalExpr>> + 'a>> {
+        self.filter
+            .as_ref()
+            .map(|f| Box::new(std::iter::once(Arc::clone(&f.expression))) as 
Box<_>)
+    }
+
+    fn with_physical_expressions(
+        &self,
+        mut params: ReplacePhysicalExpr,
+    ) -> Result<Option<Arc<dyn ExecutionPlan>>> {
+        let expected_count = self.filter.iter().len();
+        let exprs_count = params.exprs.len();
+        assert_eq_or_internal_err!(
+            expected_count,
+            exprs_count,
+            "Inconsistent number of physical expressions for {}",
+            self.name()
+        );
+
+        let filter = self
+            .filter
+            .as_ref()
+            .zip(params.exprs.pop())
+            .map(|(f, expr)| {
+                JoinFilter::new(expr, f.column_indices.clone(), 
Arc::clone(&f.schema))
+            });
+
+        Ok(Some(Arc::new(Self {
+            left: Arc::clone(&self.left),
+            right: Arc::clone(&self.right),
+            on: self.on.clone(),
+            filter,
+            join_type: self.join_type,
+            join_schema: Arc::clone(&self.join_schema),
+            left_fut: Arc::clone(&self.left_fut),

Review Comment:
   Updated the behavior of the method. Now it resets inner state.



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