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

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    [ https://issues.apache.org/jira/browse/AVRO-1954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16363305#comment-16363305 ] 

ASF GitHub Bot commented on AVRO-1954:
--------------------------------------

derekstraka commented on issue #180: AVRO-1954 - Schema.Field.defaultVal() generates: Unknown datum type org.apache.avro.JsonProperties$Null
URL: https://github.com/apache/avro/pull/180#issuecomment-365460261
 
 
   @nandorKollar - I ran into this issue today, and I'm interest in carrying this into master.  Any issues using your work as a starting point and adding you as signed off by on the commits?  I can run them by you first if you'd like.  Thanks

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> Schema.Field.defaultVal() generates: Unknown datum type org.apache.avro.JsonProperties$Null
> -------------------------------------------------------------------------------------------
>
>                 Key: AVRO-1954
>                 URL: https://issues.apache.org/jira/browse/AVRO-1954
>             Project: Avro
>          Issue Type: Bug
>          Components: java
>    Affects Versions: 1.8.1, 1.9.0
>            Reporter: rui miranda
>            Assignee: Nandor Kollar
>            Priority: Minor
>             Fix For: 1.9.0
>
>         Attachments: unitTestDefaultNull.patch
>
>
> 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?



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