[jira] [Created] (AVRO-2488) GenericData.validate(...) has inconsistent behaviour with unknown datum

["Ryan Skraba (JIRA)" <ji...@apache.org>]

Ryan Skraba created AVRO-2488:
---------------------------------

             Summary: GenericData.validate(...) has inconsistent behaviour with unknown datum
                 Key: AVRO-2488
                 URL: https://issues.apache.org/jira/browse/AVRO-2488
             Project: Apache Avro
          Issue Type: Bug
          Components: java
            Reporter: Ryan Skraba


I noticed this when working with AVRO-2642.  An unknown datum validates differently whether its in a UNION or not.

When using the schema from that JIRA with a GenericRecord:
{code:java}
{
  "type": "record",
  "name": "Lifetime",
  "fields": [
    {"name": "name", "type": "string"},
    {"name": "birth",
     "type": {"type": "string", "java-class": "java.util.Date"}},
    {"name": "death",
     "type": ["null", 
              {"type": "string", "java-class": "java.util.Date"}],
      "default": null
    }
  ]
}
{code}
The following code validates as false:
{code:java}
GenericRecord r = new GenericData.Record(theAboveSchema);
r.put("name", "William Shakespeare");
r.put("birth", new Date(-12801286800000L));
boolean isValid = GenericData.get().validate(r.getSchema(), r); // false
{code}
Fair enough – a specific record with that schema is valid, but **java-class** is a SpecificData concept that is unknown to GenericData.

The following code, however throws an exception:
{code:java}
GenericRecord r = new GenericData.Record(theAboveSchema);
r.put("name", "William Shakespeare");
r.put("birth", new Date(-12801286800000L));
r.put("death", new Date(-11161414800000L));
boolean isValid = GenericData.get().validate(r.getSchema(), r); 
// AvroRuntimeException: Unknown datum type java.util.Date
{code}
I would expect the two records to either be equally false (preferred) or to both throw an unknown datum type.



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