[AVRO-1571] Support parameterized types in Avro

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.7.6, 1.7.7, 1.8.1
• Component/s: java
• Assignee: Unassigned
• Reporter: Sachin Goyal
• Created: 23/Aug/14 17:55
• Updated: 30/Dec/18 05:33

Description

The below code cannot be serialized by Avro.

class Leaf <P, Q> {
  P p;
  Q q;
}

class Root {
  Middle1 m1;
  Middle2 m2;
  Middle3<Integer> m3;
}

class Middle1 {
  Leaf <Integer, Long> foo;
}

class Middle2 {
  Leaf <String, String> foo;
}

class Middle3 <P> {
  Leaf <P, P> foo;
}

This is because when generating the schema, only the current class is used to generate the schema.
The parent class' context is missing in ReflectData#createSchema() functions where the actual type-information is actually present.

Please see the attached test too for a simpler case.