[AVRO-1954] Schema.Field.defaultVal() generates: Unknown datum type org.apache.avro.JsonProperties$Null

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.8.1, 1.9.0
• Fix Version/s: 1.9.0
• Component/s: java
• Hadoop Flags: Reviewed
• Assignee: Nándor Kollár
• Reporter: rui miranda
• Created: 07/Nov/16 17:53
• Updated: 05/Oct/20 07:11
• Resolved: 20/Jan/17 11:53

Description

I was creating GenericRecords and populating some fields – which i could not find the content on some json files – with the Schema.Field.defaultVal().

It seems if the schema has explicitly set the default value to be null, the records generated this way can't be written. In this case, if default value is null in the schema, an instance of org.apache.avro.JsonProperties.NULL_VALUE is returned by Schema.Field.defaultVal().

I created an unit test which replicates the bug. I was thinking modify the class org.apache.avro.generic.GenericData to evaluate org.apache.avro.JsonProperties.NULL_VALUE as null. Is this the way to go? or org.apache.avro.JsonProperties.NULL_VALUE is intend for other purposes?

Issue Links

• relates to: NIFI-7882 Null as default value in avro generates exception
• links to: GitHub Pull Request #180
• links to: GitHub Pull Request #180
• links to: GitHub Pull Request #290