diff --git a/src/stream/src/executor/backfill.rs b/src/stream/src/executor/backfill.rs
index eddccb992f402..d9c2e6d8ad0bd 100644
--- a/src/stream/src/executor/backfill.rs
+++ b/src/stream/src/executor/backfill.rs
@@ -154,8 +154,11 @@ where
             && let Some(is_finished) = row.datum_at(state_len + 1)
         {
             println!("is_finished? {:?}", is_finished);
+            println!("row: {:?}", row);
             is_finished.into_bool()
         } else {
+            println!("not finished");
+            println!("row: {:?}", row);
             false
         };