Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1926#discussion_r60923428
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/table.scala
---
@@ -401,6 +400,52 @@ class Table(
new Table(relBuilder.build(), tableEnv)
}
+ /**
+ * Sorts the given [[Table]]. Similar to SQL ORDER BY. The sorting is
performed locally across
+ * all partitions with keys equal to the given fields.
+ *
+ * Example:
+ *
+ * {{{
+ * tab.orderBy('name)
+ * }}}
+ */
+ def orderBy(fields: Expression*): Table = {
+ relBuilder.push(relNode)
+
+ if (! fields.forall {
+ case x: UnresolvedFieldReference => true
+ case x@(_: Asc | _: Desc) => x.asInstanceOf[UnaryExpression]
--- End diff --
With a common base class of `Asc` and `Desc` this can be done nicer.
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