[jira] [Created] (FLINK-14642) Flink TupleSerializer and CaseClassSerializer shoud support copy NULL values

[Shang Yuanchun (Jira)]

Victor Wong created FLINK-14642:
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             Summary: Flink TupleSerializer and CaseClassSerializer shoud support copy NULL values
                 Key: FLINK-14642
                 URL: https://issues.apache.org/jira/browse/FLINK-14642
             Project: Flink
          Issue Type: Bug
          Components: API / Type Serialization System
    Affects Versions: 1.9.1
            Reporter: Victor Wong


Currently, TupleSerializer and CaseCassSerializer do not support serialize NULL values, which I think is acceptable. But not supporting to copy NULL values will cause the following codes to throw an exception, which I think is not matched with users' expectations.

*codes:*

 
{code:java}
stream.map(xxx).filter(_ != null).xxx //the return type of the map function is Tuple and it may return null{code}
 

*exception info:*

 
{code:java}
Caused by: java.lang.NullPointerExceptionCaused by: java.lang.NullPointerException at org.apache.flink.api.scala.typeutils.CaseClassSerializer.copy(CaseClassSerializer.scala:92) at org.apache.flink.api.scala.typeutils.CaseClassSerializer.copy(CaseClassSerializer.scala:32) at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:635)
{code}
 

*suggestion:*

Can we make the `copy` method of TupleSerializer/CaseClassSerializer to handle NULL values? e.g.
{code:java}
// org.apache.flink.api.scala.typeutils.CaseClassSerializer#copy
def copy(from: T): T = {
  // handle NULL values.
  if(from == null) {
    return from
  }
  initArray()
  var i = 0
  while (i < arity) {
    fields(i) = fieldSerializers(i).copy(from.productElement(i).asInstanceOf[AnyRef])
    i += 1
  }
  createInstance(fields)
}
{code}
 

 

 

 

 



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