LukaZdravic commented on PR #58776:
URL: https://github.com/apache/spark/pull/58776#issuecomment-5680345009

   Thanks @HyukjinKwon! Added the one-line comment on the backward-join 
equi-key case in cd97595 — it has at most one right row per group, so it does 
not spill, which is why it keeps plain `checkAnswer` while the forward and 
nearest cases use `checkAnswerAndSpill`.


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