Github user wuchong commented on a diff in the pull request: https://github.com/apache/flink/pull/3389#discussion_r102470461 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/utils/UserDefinedFunctionUtils.scala --- @@ -87,10 +87,16 @@ object UserDefinedFunctionUtils { // go over all signatures and find one matching actual signature .find { curSig => // match parameters of signature to actual parameters - actualSignature.length == curSig.length && + (actualSignature.length == curSig.length && curSig.zipWithIndex.forall { case (clazz, i) => parameterTypeEquals(actualSignature(i), clazz) - } + }) || + // matching the style which last argument is variable, eg. "Type..." "Type*" + (actualSignature.length >= curSig.length && + curSig.zipWithIndex.forall { case (clazz, i) => + parameterTypeEquals(actualSignature(i), clazz) || + (i == curSig.length - 1 && clazz.isArray) --- End diff -- Even if the last parameter type is an array type, it is possible not a varargs method. Such as `public void eval(int[] arrays)` , it is not a varargs method but a general method, we should add a test to check this feature not affect general array method. The best way to check whether a method is varargs is using `Method.isVarArgs()`.
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