maropu commented on issue #25830: [SPARK-29140][SQL] Handle parameters having "array" of javaType properly in HashAggregateExec URL: https://github.com/apache/spark/pull/25830#issuecomment-532916337 > Oh, this is good point. I think it is only said that aggregate function's buffer attributes can only be in certain types. Aggregate functions still can have inputs of complex data type? > However I don't know if there are existing aggregate functions in Spark take complex inputs but use buffer attributes that are acceptable for HashAggregateExec. > Just think in theory we might have such aggregate functions? might be so (I don't have a good example for that, either...). So, for safeguards, how about turning off the split mode instead of forcibly passing complex data into split functions.
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