rdblue commented on a change in pull request #1963:
URL: https://github.com/apache/iceberg/pull/1963#discussion_r569621792



##########
File path: core/src/main/java/org/apache/iceberg/avro/ValueWriters.java
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@@ -135,145 +150,145 @@ private NullWriter() {
 
     @Override
     public void write(Void ignored, Encoder encoder) throws IOException {
-      encoder.writeNull();
+      throw new IllegalStateException("[BUG] NullWriter shouldn't be used for 
writing nulls for Avro");

Review comment:
       Is this change necessary? Do you think that it would actually cause a 
problem if it were used?




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