cloud-fan commented on issue #24149: [SPARK-27207] : Ensure aggregate buffers are initialized again for So… URL: https://github.com/apache/spark/pull/24149#issuecomment-477248902 Each aggregate function will create its own buffer. When we feed a buffer to a agg func, we are not asking the agg func to replace its own buffer with the new one, but we ask it to merge the new buffer to its own buffer.
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