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https://issues.apache.org/jira/browse/AVRO-1118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13397225#comment-13397225
]
Mike Percy commented on AVRO-1118:
----------------------------------
Note that this occurs when trying to read GenericRecords via DataFileReader
when the field is not present in the data.
> Specifying null as default of a union only works if null is specified as
> first type in the union
> ------------------------------------------------------------------------------------------------
>
> Key: AVRO-1118
> URL: https://issues.apache.org/jira/browse/AVRO-1118
> Project: Avro
> Issue Type: Bug
> Affects Versions: 1.6.3
> Reporter: Mike Percy
>
> There is some unexpected behavior I am coming across where if I specify a
> union as such:
> "type": ["string", "null"],
> "default": null
> I get an Exception:
> Exception in thread "main" org.apache.avro.AvroTypeException: Non-string
> default value for string: null
> at
> org.apache.avro.io.parsing.ResolvingGrammarGenerator.encode(ResolvingGrammarGenerator.java:363)
> at
> org.apache.avro.io.parsing.ResolvingGrammarGenerator.encode(ResolvingGrammarGenerator.java:350)
> at
> org.apache.avro.io.parsing.ResolvingGrammarGenerator.getBinary(ResolvingGrammarGenerator.java:293)
> at
> org.apache.avro.io.parsing.ResolvingGrammarGenerator.resolveRecords(ResolvingGrammarGenerator.java:271)
> at
> org.apache.avro.io.parsing.ResolvingGrammarGenerator.generate(ResolvingGrammarGenerator.java:118)
> at
> org.apache.avro.io.parsing.ResolvingGrammarGenerator.generate(ResolvingGrammarGenerator.java:50)
> at org.apache.avro.io.ResolvingDecoder.resolve(ResolvingDecoder.java:82)
> at org.apache.avro.io.ResolvingDecoder.<init>(ResolvingDecoder.java:46)
> at
> org.apache.avro.io.DecoderFactory.resolvingDecoder(DecoderFactory.java:307)
> at
> org.apache.avro.generic.GenericDatumReader.getResolver(GenericDatumReader.java:118)
> at
> org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:133)
> at org.apache.avro.file.DataFileStream.next(DataFileStream.java:233)
> at org.apache.avro.file.DataFileStream.next(DataFileStream.java:220)
> ...
> Whereas if I specify the schema as:
> "type": ["null", "string"],
> "default": null
> It works as expected.
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