opwvhk commented on a change in pull request #1411:
URL: https://github.com/apache/avro/pull/1411#discussion_r767190101
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File path:
lang/java/compiler/src/main/javacc/org/apache/avro/compiler/idl/idl.jj
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@@ -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:
Nothing too magical; I can check for schemas of null with non-null:
`schema.isUnion() && schema.getTypes().size() == 2 &&
schema.getTypes().get(0).isNullable() != schema.getTypes().get(1).isNullable()`
And then swap the union if: `defaultValue != null && !defaultValue.isNull()
&& schema.getTypes().get(0).isNullable()`
However, I can also do this in the Schema.Field constructor.
Or even combine it with `org.apache.avro.Schema#isValidDefault(Schema,
JsonNode)` to select the first schema for which the default is valid, and place
it as the first schema in the union.
I've posted a poll to the dev mailinglist to choose between the options.
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