leanken opened a new pull request #29547:
URL: https://github.com/apache/spark/pull/29547
### What changes were proposed in this pull request?
Currently, EmptyHashedRelation and HashedRelationWithAllNullKeys is an
object, and it will cause JavaDeserialization Exception as following
```
20/08/26 11:13:30 WARN [task-result-getter-2] TaskSetManager: Lost task 34.0
in stage 57.0 (TID 18076, emr-worker-5.cluster-183257, executor 18):
java.io.InvalidClassException:
org.apache.spark.sql.execution.joins.EmptyHashedRelation$; no valid constructor
at
java.io.ObjectStreamClass$ExceptionInfo.newInvalidClassException(ObjectStreamClass.java:169)
at
java.io.ObjectStreamClass.checkDeserialize(ObjectStreamClass.java:874)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2042)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1572)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:430)
at
org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:76)
at
org.apache.spark.broadcast.TorrentBroadcast$.$anonfun$unBlockifyObject$4(TorrentBroadcast.scala:328)
```
This PR includes
* Using case object instead to fix serialization issue.
* Also change EmptyHashedRelation not to extend NullAwareHashedRelation
since it's already being used in other non-NAAJ joins.
### Why are the changes needed?
It will cause BHJ failed when buildSide is Empty and BHJ(NAAJ) failed when
buildSide with null partition keys.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
* Existing UT.
* Run entire TPCDS for E2E coverage.
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