rdblue commented on issue #25024: [SPARK-27296][SQL] User Defined Aggregators that do not ser/de on each input row URL: https://github.com/apache/spark/pull/25024#issuecomment-544011984 I wonder why those encoders aren't defaulted in `Aggregator`. Looks like it would work fine if the type params use TypeTag and the encoders are defaulted using `ExpressionEncoder[BUF]().resolveAndBind()`
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