Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/4536#discussion_r135430161
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/schema/FlinkTableFunctionImpl.scala
---
@@ -36,10 +36,8 @@ import org.apache.flink.table.calcite.FlinkTypeFactory
class FlinkTableFunctionImpl[T](
val typeInfo: TypeInformation[T],
val fieldIndexes: Array[Int],
- val fieldNames: Array[String],
- val evalMethod: Method)
- extends ReflectiveFunctionBase(evalMethod)
--- End diff --
In the first implementation of UDTF, we use `ReflectiveFunctionBase` to
infer the operand types. But with the new approach in this PR, we customize a
`SqlOperandTypeChecker` to check operands which means we don't need the
`ReflectiveFunctionBase` anymore. If we extends `ReflectiveFunctionBase` we
have to register every `eval` method as a UDTF. But with the new approach in
this PR, we only need to register once.
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