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From "John McClean (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AVRO-1754) C++ ValiditingDecoder handles null incorrectly
Date Wed, 25 Nov 2015 19:27:11 GMT

    [ https://issues.apache.org/jira/browse/AVRO-1754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15027425#comment-15027425
] 

John McClean commented on AVRO-1754:
------------------------------------

Can someone take a look at this issue?

> C++ ValiditingDecoder handles null incorrectly
> ----------------------------------------------
>
>                 Key: AVRO-1754
>                 URL: https://issues.apache.org/jira/browse/AVRO-1754
>             Project: Avro
>          Issue Type: Bug
>          Components: c++
>            Reporter: John McClean
>         Attachments: AVRO-1754.patch
>
>
> When decoding null, the ValidatingDecoder does not call the underlying 'decodeNull' method.
The result is that the next field decoded causes an exception.
> For example, if this json
> {quote}
> 	\{"a":null,"b":"bar"}
> {quote}
> is decoded with this schema
> {quote}
> 	\{
> 		"name": "foo",
> 		"type": "record",
> 		"fields": [
> 			\{ "name": "a", "type": ["null", "string"] },
> 			\{ "name": "b", "type": "string" }
> 		]
> 	}
> {quote}
> it throws an exception with the message "Invalid operation. Expected: String got Null".
This happens when 'b' is being decoded. I'll attach a patch.



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