HeartSaVioR edited a comment on issue #26671: Revert "[SPARK-26081][SPARK-29999]" URL: https://github.com/apache/spark/pull/26671#issuecomment-558843138 Looks like we are mixing up two different problems. Let me define the problem properly; the root issue of SPARK-29999 was due to "empty partition", not "empty job". SPARK-26081 also optimizes about "empty partition". (If empty job is also affected then that's an unintended side-effect.) That's why I have been trying to decouple "empty job" with this PR. (So that's why I said "different purpose" on request to add UT for verifying empty job.) Btw, I'm seeing what you meant about "details"; thanks for providing the detailed explanation! Let me update the description so that we say about "empty partition", not "empty job".
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