EmilyMatt commented on code in PR #20482:
URL: https://github.com/apache/datafusion/pull/20482#discussion_r2838549118


##########
datafusion/physical-plan/src/joins/sort_merge_join/stream.rs:
##########
@@ -598,13 +600,53 @@ impl Stream for SortMergeJoinStream {
                     self.current_ordering = self.compare_streamed_buffered()?;
                     self.state = SortMergeJoinState::JoinOutput;
                 }
+                SortMergeJoinState::EmitReady { next_state } => {
+                    // If have data to emit, emit it and if no more, change to 
next
+
+                    // Verify metadata alignment before checking if we have 
batches to output
+                    self.joined_record_batches
+                        .filter_metadata
+                        .debug_assert_metadata_aligned();
+
+                    // For filtered joins, skip output and let Init state 
handle it
+                    if needs_deferred_filtering(&self.filter, self.join_type) {
+                        self.state = next_state.as_ref().clone();
+                        continue;
+                    }
+
+                    // TODO - NEED TO CHECK IF WE HAVE ENOUGH DATA TO FILL 
BATCH
+                    // TODO - WHAT ABOUT

Review Comment:
   WHAT 👏 ABOUT 👏 



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