[jira] [Created] (FLINK-4879) class KafkaTableSource should be public just like KafkaTableSink

[Shang Yuanchun (Jira)]

yuemeng created FLINK-4879:
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             Summary: class KafkaTableSource should be public just like KafkaTableSink
                 Key: FLINK-4879
                 URL: https://issues.apache.org/jira/browse/FLINK-4879
             Project: Flink
          Issue Type: Bug
          Components: Kafka Connector
    Affects Versions: 1.1.3, 1.1.1
            Reporter: yuemeng
            Priority: Minor
             Fix For: 1.1.4


class KafkaTableSource should be public just like KafkaTableSink,by default,it's modifier is default ，and we cann't access out of it's package,for example:
 def createKafkaTableSource(
      topic: String,
      properties: Properties,
      deserializationSchema: DeserializationSchema[Row],
      fieldsNames: Array[String],
      typeInfo: Array[TypeInformation[_]]): KafkaTableSource = {

    if (deserializationSchema != null) {
      new Kafka09TableSource(topic, properties, deserializationSchema, fieldsNames, typeInfo)
    } else {
      new Kafka09JsonTableSource(topic, properties, fieldsNames, typeInfo)
    }
  }


Because of the class KafkaTableSource modifier is default,we cann't define this function result type with KafkaTableSource ,we must give the specific type.
if some other kafka source extends KafkaTableSource ,and we don't sure which subclass of KafkaTableSource should be use,how can we specific the type?






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