Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/3418#discussion_r103127935
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/FlatMapRunner.scala
---
@@ -43,7 +45,15 @@ class FlatMapRunner[IN, OUT](
LOG.debug(s"Compiling FlatMapFunction: $name \n\n Code:\n$code")
val clazz = compile(getRuntimeContext.getUserCodeClassLoader, name,
code)
LOG.debug("Instantiating FlatMapFunction.")
- function = clazz.newInstance()
+ if (null == parameterValues || null == parameterTypes ||
+ parameterValues.length == 0 || parameterTypes.length == 0 ||
+ parameterTypes.length != parameterValues.length) {
--- End diff --
I think we do not need to check `parameterValues.length == 0`, if the
parameter length is 0, it also can be handled correctly by the `else` brach.
And also, I think we should not to check `parameterTypes.length !=
parameterValues.length`, in this case, a compile exception thrown would be
better rather than ignoring the parameters and using the 0-parameter
constructor.
So I think `null == parameterValues || null == parameterTypes` is enough
and simpler.
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