Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/11010#discussion_r51526748
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
---
@@ -424,3 +424,69 @@ case class Murmur3Hash(children: Seq[Expression],
seed: Int) extends Expression
}
}
}
+
+/**
+ * A function that calculates hash value for a group of expressions,
which basically XOR all the
+ * hash code of children expressions together.
+ *
+ * Note: This is used for hash map for aggreagte, designed for
performance (has worse
--- End diff --
UnsafeRow will call murmur3, which is still slow
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