comphead commented on code in PR #12090:
URL: https://github.com/apache/datafusion/pull/12090#discussion_r1724072448


##########
datafusion/physical-plan/src/joins/sort_merge_join.rs:
##########
@@ -1229,11 +1229,19 @@ impl SMJStream {
             }
             buffered_batch.null_joined.clear();
 
-            // For buffered rows which are joined with streamed side but 
doesn't satisfy the join filter
+            // For buffered row which is joined with streamed side rows but 
all joined rows
+            // don't satisfy the join filter
             if output_not_matched_filter {
+                let buffered_indices = buffered_batch

Review Comment:
   perhaps we can name it `not_matched_buffered_indices` to let know what 
exactly those indices are



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