[jira] [Created] (AVRO-1754) C++ ValiditingDecoder handles null incorrectly

[John McClean (JIRA)]

John McClean created AVRO-1754:
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             Summary: 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


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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