Jeff Maxwell created AVRO-2131:
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Summary: Records with unions with self references fail to parse.
Key: AVRO-2131
URL: https://issues.apache.org/jira/browse/AVRO-2131
Project: Avro
Issue Type: Bug
Components: java
Affects Versions: 1.8.1
Environment: Java 1.8.0_152-b1
Reporter: Jeff Maxwell
Records with unions with self references fail to parse.
The example below fails to parse with {{"Type not supported: Node"}}
{code:javascript}
[
{
"namespace": "tree",
"type": "record",
"name": "Node",
"fields": [
{
"name": "left",
"type": [
"null",
{
"type": "Node"
}
],
"default": null
},
{
"name": "right",
"type": [
"null",
{
"type": "Node"
}
],
"default": null
}
]
}
]
{code}
When we don't allow nullability it parses successfully:
{code:javascript}
[
{
"namespace": "tree",
"type": "record",
"name": "Node",
"fields": [
{
"name": "left",
"type": "Node"
},
{
"name": "right",
"type": "Node"
}
]
}
]
{code}
The root cause: When the second element of the union, {{{"type":"Node"}}}, is
parsed there is no path that can successfully handle the {{JsonNode}}.
The solution is to add this logic to the {{Schema.parse(JsonNode schema, Names
names)}} method:
{code:java}
} else { //For unions with self reference
Name nameFromType = new Name(type, names.space);
if (names.containsKey(nameFromType)) {
return names.get(nameFromType);
}
throw new SchemaParseException("Type not supported: "+type);
}
{code}
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