dongjoon-hyun commented on issue #24762: [SPARK-27907][SQL] HiveUDAF should return NULL in case of 0 rows URL: https://github.com/apache/spark/pull/24762#issuecomment-498055201 SPARK-24935 causes this regression at `2.3.4`/`2.4.3`/`3.0.0` and only `2.4.3` is released. I backported this to `branch-2.3` since `2.3.4-SNAPSHOT` has this regression, too.
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