dongjoon-hyun commented on issue #24682: [SPARK-27762][SQL] [FOLLOWUP] Add 
behavior change for Avro writer in migration guide
URL: https://github.com/apache/spark/pull/24682#issuecomment-495054805
 
 
   I understand the concern about the difference from our default `.schema` 
option. I believe this is the main reason why we add `.option("avroSchema", 
...)`.
   
   For Avro, `nullable` column type is `"type": ["int", "null"]` and 
non-nullable column type is `"type": "int"` explicitly.

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