[jira] [Created] (SPARK-43361) Allow deserializing protobuf enum fields as integers

["Parth Upadhyay (Jira)" <ji...@apache.org>]

Parth Upadhyay created SPARK-43361:
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             Summary: Allow deserializing protobuf enum fields as integers
                 Key: SPARK-43361
                 URL: https://issues.apache.org/jira/browse/SPARK-43361
             Project: Spark
          Issue Type: Improvement
          Components: Protobuf
    Affects Versions: 3.4.0
            Reporter: Parth Upadhyay


When deserializing protobuf enum fields, the spark-protobuf library will deserialize them as string values based on the enum name in the proto. E.g. 
{code:java}
message Person {
  enum Job {
    NOTHING = 0;
    ENGINEER = 1;
    DOCOTR = 2;
  }
  Job job = 1;
}{code}
And we have a message like
{code:java}
Job(ENGINEER){code}
Then the deserialized value will be:
{code:java}
{"job": "ENGINEER"}{code}
However it can be useful to deserialize the enum integer value rather than the name (and this option exists in other major libraries). So, namely:
{code:java}
{"job": 1}{code}
 

Examples in other libraries:
 * protobuf-java-util JsonFormat: [https://javadoc.io/doc/com.google.protobuf/protobuf-java-util/3.10.0/com/google/protobuf/util/JsonFormat.Printer.html#printingEnumsAsInts--]
 * golang/protobuf jsonpb marshaler [https://pkg.go.dev/github.com/golang/protobuf/jsonpb#Marshaler]


I propose extending spark-protobuf to add this functionality.



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