opwvhk commented on a change in pull request #1411:
URL: https://github.com/apache/avro/pull/1411#discussion_r767190931
##########
File path:
lang/java/compiler/src/main/javacc/org/apache/avro/compiler/idl/idl.jj
##########
@@ -182,6 +183,32 @@ public class Idl implements Closeable {
return result;
}
+ /**
+ * For "optional schemas" (recognized by the marker property the NullableType
+ * production adds), ensure the null schema is in the right place.
+ *
+ * @param schema a schema
+ * @param defaultValue the intended default value
+ * @return the schema, or an optional schema with null in the right place
+ */
+ private static Schema fixOptionalSchema(Schema schema, JsonNode
defaultValue) {
Review comment:
The main problem is a) union instances must still have the default value
match the first schema (I don't know enough to relax that constraint), and b)
the union will not be what was written.
As a result, my preference is to restrict this feature to the `?` syntax.
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