Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/3389#discussion_r105187427
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/utils/UserDefinedFunctionUtils.scala
---
@@ -139,9 +143,35 @@ object UserDefinedFunctionUtils {
s"Function class '${function.getClass.getCanonicalName}' does not
implement at least " +
s"one method named 'eval' which is public, not abstract and " +
s"(in case of table functions) not static.")
- } else {
- methods
}
+
+ verifyScalaVarargsAnnotation(methods)
+ methods
+ }
+
+ /**
+ * If users specified an @varargs, Scala will generate two methods
indeed.
+ * If there does not exist corresponding varargs method of the Seq
method,
+ * we will throw an ValidationException.
+ */
+ def verifyScalaVarargsAnnotation(methods: Array[Method]) = {
+ methods.foreach(method => {
+ val signatures = method.getParameterTypes
+ if (signatures.nonEmpty &&
+ signatures.last.getName.equals("scala.collection.Seq") &&
--- End diff --
Can you add a test data to `UserDefinedScalaFunctionTest` with
```
data: testData.setField(9, Seq("Hello", "World"))
typeInfo: org.apache.flink.api.scala.createTypeInformation[Seq[String]]
test: testAllApis(
Func16('f9),
"Func15(f9)",
"Func15(f9)",
"Hello, World"
)
```
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