xkrogen commented on a change in pull request #33308:
URL: https://github.com/apache/spark/pull/33308#discussion_r674952903



##########
File path: 
external/avro/src/test/scala/org/apache/spark/sql/avro/AvroSerdeSuite.scala
##########
@@ -86,18 +86,18 @@ class AvroSerdeSuite extends SparkFunSuite {
     // deserialize should have no issues when 'bar' is nullable but fail when 
it is nonnull
     Deserializer.create(CATALYST_STRUCT, avro, BY_NAME)
     assertFailedConversionMessage(avro, Deserializer, BY_NAME,
-      "Cannot find non-nullable field 'foo.bar' (at position 0) in Avro 
schema.",
+      "Cannot find field 'foo.bar' (at position 0) in Avro schema at field 
'foo'",
       nonnullCatalyst)
     assertFailedConversionMessage(avro, Deserializer, BY_POSITION,
-      "Cannot find non-nullable field at position 1 (field 'foo.baz') in Avro 
schema.",
+      "Cannot find field at position 1 ('foo.baz') in Avro schema at field 
'foo'",

Review comment:
       Sorry I don't understand, are you saying you think the expected message 
is incorrect? One thing to note is that this test is on `extraNonnullCatalyst` 
as the Catalyst schema, whereas the previous test is on `nonnullCatalyst`. We 
need an extra field because `CATALYST_STRUCT` and `nonnullCatalyst` have the 
same field count as `avro`, so when doing `BY_POSITION` it will succeed. Thus 
we use `extraNonnullCatalyst` which has an extra field `foo.baz` at position 1.




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