Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/3389#discussion_r102448156
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/utils/UserDefinedFunctionUtils.scala
---
@@ -140,6 +147,25 @@ object UserDefinedFunctionUtils {
s"one method named 'eval' which is public, not abstract and " +
s"(in case of table functions) not static.")
} else {
+ var trailingSeq = false
+ var trailingArray = false
+ methods.foreach(method => {
+ val signatures = method.getParameterTypes
+ if (signatures.nonEmpty) {
+ val trailingArg = signatures(signatures.length - 1)
+ if (trailingArg.getName.equals("scala.collection.Seq")) {
+ trailingSeq = true
+ } else if (trailingArg.isArray) {
+ trailingArray = true
+ }
+ }
+ })
+ if (trailingSeq && !trailingArray) {
+ // We found trailing "scala.collection.Seq", but no trailing
"Type[]", "Type..."
+ throw new ValidationException("The 'eval' method do not support
Scala type of " +
+ "variable args eg. scala.collection.Seq or Type*, please add a
@varargs annotation " +
--- End diff --
change `@varargs` to `@scala.annotation.varargs` will be more clear ?
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