viirya 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-532908027 > btw, agg_expr_1_1 is not used inside the aggregation function. Actually, in HashAggregateExec, aggregation functions can only process fixed-length typed data and decimal values? 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?
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