adriangb commented on code in PR #20455:
URL: https://github.com/apache/datafusion/pull/20455#discussion_r2991466491


##########
datafusion/physical-plan/src/joins/sort_merge_join/exec.rs:
##########
@@ -594,4 +600,56 @@ impl ExecutionPlan for SortMergeJoinExec {
             self.null_equality,
         )?)))
     }
+
+    fn gather_filters_for_pushdown(
+        &self,
+        _phase: FilterPushdownPhase,
+        parent_filters: Vec<Arc<dyn PhysicalExpr>>,
+        _config: &ConfigOptions,
+    ) -> Result<FilterDescription> {
+        // Only support Inner joins for now — other join types have complex
+        // column routing semantics (e.g. nullable sides, semi/anti output
+        // restrictions) that require careful handling.

Review Comment:
   Up to you. I have no issue leaving it open and more work gets pushed in a 
couple weeks. Longer than that and yeah lets close it.



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