Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/18136#discussion_r118855831
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
---
@@ -104,3 +107,25 @@ case class CurrentDatabase() extends LeafExpression
with Unevaluable {
override def nullable: Boolean = false
override def prettyName: String = "current_database"
}
+
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage = "_FUNC_() - Returns a universally unique identifier (UUID)
string. The value is returned as a canonical UUID 36-character string.",
+ extended = """
+ Examples:
+ > SELECT _FUNC_();
+ 46707d92-02f4-4817-8116-a4c3b23e6266
+ """)
+// scalastyle:on line.size.limit
+case class Uuid() extends LeafExpression with CodegenFallback {
+ override def foldable: Boolean = true
--- End diff --
I don't think this function is foldable. If this is foldable, it means we
might use the same UUID generated by optimizer for all rows.
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