Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/9038#discussion_r41581219
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/functions.scala
---
@@ -546,6 +546,9 @@ case class HyperLogLogPlusPlus(child: Expression,
relativeSD: Double = 0.05)
AttributeReference(s"MS[$i]", LongType)()
}
+ override val inputAggBufferAttributes: Seq[AttributeReference] =
--- End diff --
To explain what's going on here: it turns out that the refactoring in #8973
to lift this into `InterpretedAggregate` ended up introducing a bug due to lazy
val initialization issues. To avoid this, I just pushed these copies to the
leaves of our inheritance hierarchy and removed the default implementation from
the parent class.
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