[jira] [Commented] (AVRO-1590) [java] AllowNull causes unexpected resolution failure

["Doug Cutting (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AVRO-1590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14146533#comment-14146533 ] 

Doug Cutting commented on AVRO-1590:
------------------------------------

I'm confused.  Why is it wrong to require a full name match here?  An alias could be used, or the manually defined schema can specify the namespace.  What am I missing?

> [java] AllowNull causes unexpected resolution failure
> -----------------------------------------------------
>
>                 Key: AVRO-1590
>                 URL: https://issues.apache.org/jira/browse/AVRO-1590
>             Project: Avro
>          Issue Type: Bug
>    Affects Versions: 1.7.7
>            Reporter: Ryan Blue
>            Assignee: Ryan Blue
>         Attachments: AVRO-1590-1.patch
>
>
> If I try to read data serialized with a hand-written schema using a reflected schema generated by AllowNull, even though all of the individual types can be read. Here is a failing test:
> {code:java}
>   public static class Point {
>     double x;
>     double y;
>   }
>   public static class Circle {
>     Point center;
>     double radius;
>   }
>   @Test
>   public void testAllowNull() throws Exception {
>     new SchemaValidatorBuilder()
>         .canBeReadStrategy()
>         .validateLatest().validate(
>         SchemaBuilder.record("Circle").fields()
>             .name("center").type().record("Point").fields()
>             .requiredDouble("x")
>             .requiredDouble("y")
>             .endRecord().noDefault()
>             .requiredDouble("radius")
>             .endRecord(),
>         Arrays.asList(ReflectData.AllowNull.get().getSchema(Circle.class)));
>   }
> {code}
> The problem is that the {{ResolvingGrammarGenerator}} can't resolve a record with a nullable record unless the two have the same [full name|https://github.com/apache/avro/blob/trunk/lang/java/avro/src/main/java/org/apache/avro/io/parsing/ResolvingGrammarGenerator.java#L439].
> It is more work, but I think the check should be whether there is a readable record in the union. Another alternative is to special case a nullable union and allow the record-level resolution only in that case.



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