[jira] [Created] (AVRO-1664) PHP library can't serialise records with optional (union-null) values

["Paul Banks (JIRA)" <ji...@apache.org>]

Paul Banks created AVRO-1664:
--------------------------------

             Summary: PHP library can't serialise records with optional (union-null) values
                 Key: AVRO-1664
                 URL: https://issues.apache.org/jira/browse/AVRO-1664
             Project: Avro
          Issue Type: Bug
          Components: php
    Affects Versions: 1.7.7
         Environment: php 5.5.15 OS X 10.9 
            Reporter: Paul Banks


PHP avro serialising doesn't appear to support "optional" fields in records.

Consider the PHP script below:

{code}
<?php

require_once('lib/avro.php');

$schema_json = <<<_JSON
{"name":"member",
 "type":"record",
 "fields":[{"name":"one", "type":"int"},
           {"name":"two", "type":["null", "string"]}
           ]}
_JSON;

$schema = AvroSchema::parse($schema_json);

// Our datum is missing the 'optional' field (i.e. it's null)
$datum = array("one" => 1);

$io = new AvroStringIO();
$writer = new AvroIODatumWriter($schema);
$encoder = new AvroIOBinaryEncoder($io);
$writer->write($datum, $encoder);
$bin = $io->string();

echo bin2hex($bin) . "\n";
{code}

My understanding from documentation is that this should work and output the encoded binary in hex.

Instead it throws:

{code}
PHP Fatal error:  Uncaught exception 'AvroIOTypeException' with message 'The datum array (
  'one' => 1,
) is not an example of schema {"type":"record","name":"member","fields":[{"name":"one","type":"int"},{"name":"two","type":["null","string"]}]}'
{code}

It's possible that this is not a valid usage of Avro and I'm mistaken in my expectations, so I tried the python library as a comparison. Sure enough the following script works as expected:

{code}
from avro import schema
from avro import io
from StringIO import StringIO

s = schema.parse("""
    {"name":"member",
    "type":"record",
    "fields":[{"name":"one", "type":"int"},
              {"name":"two", "type":["null", "string"]}
             ]}""")

writer = StringIO()
encoder = io.BinaryEncoder(writer)
datum_writer = io.DatumWriter(s)
datum_writer.write({"one": 1}, encoder)

print writer.getvalue().encode("hex")
{code}

which outputs:

{code}
$ python avro_test.py
0200
{code}

As expected.



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