Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/10435#discussion_r48280175
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
---
@@ -161,3 +163,197 @@ case class Crc32(child: Expression) extends
UnaryExpression with ImplicitCastInp
})
}
}
+
+/**
+ * A function that calculates hash value for a group of expressions.
+ */
--- End diff --
oh, it is also good to mention the compatibility benefit of following Hive
at here.
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