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[jira] [Created] (FLINK-9834) Unable to support scala BasicArrayTypeInfo

buptljy created FLINK-9834:

             Summary: Unable to support scala BasicArrayTypeInfo
                 Key: FLINK-9834
                 URL: https://issues.apache.org/jira/browse/FLINK-9834
             Project: Flink
          Issue Type: Bug
          Components: Type Serialization System
            Reporter: buptljy

BasicArrayTypeInfo does not supported scala type in some circumstances. For example,

// we set a descriptor here and get value from it.
val datas: mutable.Map[String, Array[Byte]] = mutable.Map()
val descriptor = new MapStateDescriptor("realtime-state",
    BasicTypeInfo.STRING_TYPE_INFO, BasicArrayTypeInfo.BYTE_ARRAY_TYPE_INFO)
val state = context.getKeyedStateStore.getMapState(descriptor)
val iter = state.entries().iterator()
while (iter.hasNext) {
   val entry = iter.next()
   datas.put(entry.getKey, entry.getValue)
The codes above cannot be compiled successfully because the "state" is using java.lang.Byte but the "datas" is using scala.Byte, and we have to iterate all values of the Array like "datas.put(entry.getKey, entry.getValue.map(byte => byte.asInstanceOf[Byte]))", which is definitely not what we want.

I suggest that we create a ScalaBasicArrayTypeInfo like the "BasicArrayTypeInfo" for scala.

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