Github user gengliangwang commented on a diff in the pull request:
https://github.com/apache/spark/pull/22094#discussion_r209810119
--- Diff:
external/avro/src/main/scala/org/apache/spark/sql/avro/AvroSerializer.scala ---
@@ -212,7 +222,7 @@ class AvroSerializer(rootCatalystType: DataType,
rootAvroType: Schema, nullable:
}
private def resolveNullableType(avroType: Schema, nullable: Boolean):
Schema = {
- if (nullable) {
+ if (nullable && avroType.getType != NULL) {
--- End diff --
This fixes a trivial bug if `avroType` is NULL type.
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