Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/4274#discussion_r126870651
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/scala/expressionDsl.scala
---
@@ -982,4 +982,27 @@ object randInteger {
}
}
+/**
+ * Returns the string that results from concatenating the arguments.
+ * Returns NULL if any argument is NULL.
+ */
+object concat {
+ def apply(strings: Expression*): Expression = {
--- End diff --
I would suggest to change this signature to `apply(first: Expression,
second: Expression, rest: Expression*)` to avoid misusage such as `concat()`.
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