Github user yhuai commented on a diff in the pull request: https://github.com/apache/spark/pull/14753#discussion_r76152853 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/interfaces.scala --- @@ -389,3 +389,144 @@ abstract class DeclarativeAggregate def right: AttributeReference = inputAggBufferAttributes(aggBufferAttributes.indexOf(a)) } } + +/** + * Aggregation function which allows **arbitrary** user-defined java object to be used as internal + * aggregation buffer object. + * + * {{{ + * aggregation buffer for normal aggregation function `avg` + * | + * v + * +--------------+---------------+-----------------------------------+ + * | sum1 (Long) | count1 (Long) | generic user-defined java objects | + * +--------------+---------------+-----------------------------------+ + * ^ + * | + * Aggregation buffer object for `TypedImperativeAggregate` aggregation function + * }}} --- End diff -- Let's also add a normal agg buffer after the generic one. So, readers will not assume that generic ones will always be put at the end.
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