cloud-fan commented on a change in pull request #24405: [SPARK-27506][SQL] 
Allow deserialization of Avro data using compatible schemas
URL: https://github.com/apache/spark/pull/24405#discussion_r313836701
 
 

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 File path: 
external/avro/src/main/scala/org/apache/spark/sql/avro/AvroDataToCatalyst.scala
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 @@ -53,7 +54,9 @@ case class AvroDataToCatalyst(
 
   @transient private lazy val avroSchema = new 
Schema.Parser().parse(jsonFormatSchema)
 
-  @transient private lazy val reader = new GenericDatumReader[Any](avroSchema)
 
 Review comment:
   do you mean the reader must use a schema that matches the avro encoded 
binary, but we can use a compatible schema in `AvroDeserializer`, which can do 
schema evolution?

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