[AVRO-2415] Regression: Schema evolution of union containing array fails in 1.9.0

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.9.0
• Fix Version/s: 1.9.1
• Component/s: java
• Assignee: Martin Jubelgas
• Reporter: Martin Jubelgas
• Created: 06/Jun/19 18:35
• Updated: 07/Feb/20 08:39
• Resolved: 17/Jun/19 09:31

Description

I've come across another example that does not resolve in 1.9.0 but did in 1.8.2:

  public void testArrayInUnion() throws Exception {
    Schema writerSchema = SchemaBuilder.array().items().intType();
    Schema readerSchema = SchemaBuilder.unionOf()
                                 .nullType()
                                 .and()
                                 .array().items().intType().endUnion();

    ResolvingDecoder.resolve(writerSchema, readerSchema );
  }

results in just the same kind of exception (even with pull request #526 applied)

java.lang.ClassCastException: org.apache.avro.Resolver$ReaderUnion cannot be cast to org.apache.avro.Resolver$Container
    at org.apache.avro.io.parsing.ResolvingGrammarGenerator.generate(ResolvingGrammarGenerator.java:95)
    at org.apache.avro.io.parsing.ResolvingGrammarGenerator.generate(ResolvingGrammarGenerator.java:65)
    at org.apache.avro.io.ResolvingDecoder.resolve(ResolvingDecoder.java:85)

Issue Links

• duplicates: AVRO-2400 Avro 1.9.0 can't resolve schemas that can be resolved in 1.8.2
• is duplicated by: AVRO-2418 BUG in schema resolver, when resolving map<> to union {null, map<>}
• links to: GitHub Pull Request #537