[jira] [Created] (AVRO-3194) [C++] Parsing avro file using `GenericDatum` results in segmentation fault

["Oscar Zhang (Jira)" <ji...@apache.org>]

Oscar Zhang created AVRO-3194:
---------------------------------

             Summary: [C++] Parsing avro file using `GenericDatum` results in segmentation fault
                 Key: AVRO-3194
                 URL: https://issues.apache.org/jira/browse/AVRO-3194
             Project: Apache Avro
          Issue Type: Bug
          Components: c++
         Environment: Ubuntu on AWS EC2
            Reporter: Oscar Zhang


Hello,

I wonder what's the correct example of parsing an avro input stream into a vector of `GenericRecord`?

I am trying to parse .avro file using `GenericDatum` to store them in a vector of `GenericRecord`, but I got a segmentation fault (signal 11) when I am trying to call `datum.value()`. Here is the sample code that I am writing:
{code:java}
std::unique_ptr<avro::InputStream> avroInputStream  = avro::istreamInputStream(retrievedFile); // `retrievedFile` is a basic_iostream from AWS S3

// get the schema file
std::stringstream schemaInput(schemaName);
avro::ValidSchema validSchema;
avro::compileJsonSchema(schemaInput, validSchema);

// read the data input stream with the given valid schema
avro::DataFileReader<avro::GenericDatum> fileReader(move(avroInputStream));
avro::GenericDatum datum(fileReader.dataSchema());
std::vector<avro::GenericRecord> recordArray;
while (fileReader.read(datum)) {
    if (datum.type() == avro::AVRO_RECORD) {
        std::cout << "[Check 1]" << std::endl;
        const avro::GenericRecord record = datum.value<avro::GenericRecord>(); // result in segmentation fault
        std::cout << "[Check 2]" << std::endl;
        recordArray.push_back(record);
    }
}

// processing the recordArray further
...{code}



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