Github user godfreyhe commented on a diff in the pull request:
https://github.com/apache/flink/pull/3176#discussion_r99532146
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/CodeGenerator.scala
---
@@ -220,56 +247,105 @@ class CodeGenerator(
// manual casting here
val samHeader =
// FlatMapFunction
- if (clazz == classOf[FlatMapFunction[_,_]]) {
+ if (clazz == classOf[FlatMapFunction[_, _]]) {
--- End diff --
We can not choose `FlatMapFunction` or `RichFlatMapFunction` in
`translateToPlan` method, unless We know whether the current rexNode contains
`UserDefinedFunction`s. However CodeGenerator is a kind of RexVisitor and know
`UserDefinedFunction` when `generateExpression` called.
Besides, `RichFlatMapFunction` implements `FlatMapFunction`, so It's
reasonable that Users call the generateFunction(desc,
classOf[FlatMapFunction[Any, Any]], body, returnType) and returned a
RichFlatMapFunction.
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