jerrypeng commented on issue #3741: POJO AvroSchema always allowNull URL: https://github.com/apache/pulsar/issues/3741#issuecomment-469540392 @sijie @skyrocknroll I just experimented a little. Given the schema that @skyrocknroll posted on the pulsar chat as an example: ``` { "namespace": "example.avro", "type": "record", "name": "User", "fields": [ { "name": "name", "type": "string" }, { "name": "favorite_number", "type": [ "int", "null" ] }, { "name": "favorite_color", "type": "string" }, { "name": "age", "type": "int", "default": 19 } ] } ``` I did some tests using the generated java class with the ReflectData schema generator: ``` log.info("{}", new String(AvroSchema.of(User.class).getSchemaInfo().getSchema())); log.info("{}", ReflectData.get().getSchema(User.class)); log.info("{}", ReflectData.AllowNull.get().getSchema(User.class)); ``` They all produced the same result: ``` 21:07:27.741 [main:org.company.Test4@44] INFO org.company.Test4 - {"type":"record","name":"User","namespace":"example.avro","fields":[{"name":"name","type":"string"},{"name":"favorite_number","type":["int","null"]},{"name":"favorite_color","type":"string"},{"name":"age","type":"int","default":19}]} 21:07:27.746 [main:org.company.Test4@46] INFO org.company.Test4 - {"type":"record","name":"User","namespace":"example.avro","fields":[{"name":"name","type":"string"},{"name":"favorite_number","type":["int","null"]},{"name":"favorite_color","type":"string"},{"name":"age","type":"int","default":19}]} 21:07:27.746 [main:org.company.Test4@48] INFO org.company.Test4 - {"type":"record","name":"User","namespace":"example.avro","fields":[{"name":"name","type":"string"},{"name":"favorite_number","type":["int","null"]},{"name":"favorite_color","type":"string"},{"name":"age","type":"int","default":19}]} ``` regardless of whether AllowNull is set or not. So my question still holds what exactly does removing AllowNull change?
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