Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/9599#discussion_r44444404
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/expressions/Aggregator.scala ---
@@ -58,6 +58,11 @@ abstract class Aggregator[-A, B, C] {
def reduce(b: B, a: A): B
/**
+ * Merge two intermediate values
+ */
+ def merge(b1: B, b2: B): B
--- End diff --
@mateiz JFYI, I missed adding this in the first iteration, but I think we
need it if we are going to do multilevel aggregation.
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