[jira] [Created] (AVRO-1172) Avro C++ Json Decoder: Double cannot be decoded

[Sam Overend (JIRA)]

Sam Overend created AVRO-1172:
---------------------------------

             Summary: Avro C++ Json Decoder: Double cannot be decoded
                 Key: AVRO-1172
                 URL: https://issues.apache.org/jira/browse/AVRO-1172
             Project: Avro
          Issue Type: Bug
          Components: c++
    Affects Versions: 1.7.1
         Environment: Built under msys and gcc-4.6.1 on a Windows7/64 bit 
machine.
            Reporter: Sam Overend


Short version: Looks like the C++ version of AVRO-1099.
Long version: When a non-decimal double is read from a json file, the parser 
treats it as an long, not a double, and therefore throws an exception. 

Two possible solutions: (1) The decoder should be able to convert longs to 
doubles or acknowledge that a long is a type of double. 
(2) The encoder should always output a double with a decimal point.


Example code is included below. Output is:
(1.01, 2.13)
terminate called after throwing an instance of 'avro::Exception'
  what():  Incorrect token in the stream. Expected: Double, found Integer

After running complex.json is: {"re":1,"im":2.13


#include <iostream>
#include <fstream>

using namespace std;

#include "cpx.hh"
#include "avro/Compiler.hh"
#include "avro/Encoder.hh"
#include "avro/Decoder.hh"

avro::ValidSchema load(const char* filename)
{
    std::ifstream ifs(filename);
    avro::ValidSchema result;
    avro::compileJsonSchema(ifs, result);
    return result;
}

void OutTest()
{
    avro::ValidSchema cpxSchema = load("cpx_schema.json");

    std::auto_ptr<avro::OutputStream> out = 
avro::fileOutputStream("complex.json",1);
    avro::EncoderPtr e = avro::jsonEncoder(cpxSchema);
    e->init(*out);
    c::cpx c1;
    c1.re = 1.01;
    c1.im = 2.13;
    avro::encode(*e, c1);
    out->flush();
}

void OutTest2()
{
    avro::ValidSchema cpxSchema = load("cpx_schema.json");

    std::auto_ptr<avro::OutputStream> out = 
avro::fileOutputStream("complex.json",1);
    avro::EncoderPtr e = avro::jsonEncoder(cpxSchema);
    e->init(*out);
    c::cpx c1;
    c1.re = 1.0;
    c1.im = 2.13;
    avro::encode(*e, c1);
    out->flush();
}

void InTest()
{
    avro::ValidSchema cpxSchema = load("cpx_schema.json");
    std::auto_ptr<avro::InputStream> in = 
avro::fileInputStream("complex.json",1);
    avro::DecoderPtr d = avro::jsonDecoder(cpxSchema);
    d->init(*in);
    c::cpx c2;
    avro::decode(*d, c2);
    std::cout << '(' << c2.re << ", " << c2.im << ')' << std::endl;
}

int main()
{
    OutTest();
    InTest();
    OutTest2();
    InTest();
    return 0;
}

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