Github user wuchong commented on a diff in the pull request: https://github.com/apache/flink/pull/3389#discussion_r102472512 --- 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) { --- End diff -- The `eval` method can be overloaded. Such as : ```scala def eval(args: Array[Int]): Int = {} def eval(args: Int*): Int = {} ``` In this case, the methods can satisfy the condition, but the exception should be thrown.
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