Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/6971#discussion_r33439723
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
---
@@ -47,4 +48,44 @@ case class Md5(child: Expression)
"org.apache.spark.unsafe.types.UTF8String.fromString" +
s"(org.apache.commons.codec.digest.DigestUtils.md5Hex($c))")
}
+
+}
+
+/**
+ * A function that returns a hash value of the argument
+ */
+case class Hash(children: Expression*) extends Expression {
+
+ override def foldable: Boolean = children.forall(_.foldable)
+ override def nullable: Boolean = children(0).nullable
+ override def dataType: DataType = IntegerType
+
+ override def eval(input: InternalRow): Any = {
+ val arglist = children.map(_.eval(input).asInstanceOf[AnyRef])
--- End diff --
Is there other types we should take it special? They all fall back to call
`hashCode()`
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