[AVRO-1986] SchemaFromJSONData does not invert to_json method

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 1.8.1
• Component/s: python
• Assignee: Unassigned
• Reporter: Alexander Hasha
• Created: 23/Jan/17 04:15
• Updated: 23/Jan/17 04:16

Description

A record schema containing a fixed field causes an error when trying to invert `to_json` with `SchemaFromJSONData`.

To reproduce, using avro-python3==1.8.1 and python 3.6.0

>>> test_schema_str = """
... {
...     "type"        : "record",
...     "namespace"   : "dataset",
...     "name"        : "test_dataset",
...     "fields": [
...         {"type": "int"   , "name": "field_1"},
...         {"type": "string", "name": "field_2"},
...         {"default": null, "name": "field_3", "type": ["null", "long"]},
...         { "name": "features", "type": { "type": "map", "values": "double"}},
...         { "name": "words", "type": {"type": "array", "items": "string"}},
...         { "name": "bytes", "type": {"type": "fixed", "name": "Bytes", "size": 16}}
...     ]
... }
... """
>>> from avro.schema import SchemaFromJSONData  
>>> from avro.schema import Parse
>>> SchemaFromJSONData(Parse(test_schema_str).to_json())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<redacted>/python3.6/site-packages/avro/schema.py", line 1254, in SchemaFromJSONData
    return parser(json_data, names=names)
  File "<redacted>/python3.6/site-packages/avro/schema.py", line 1182, in _SchemaFromJSONObject
    other_props=other_props,
  File "<redacted>/python3.6/site-packages/avro/schema.py", line 1061, in __init__
    fields = make_fields(names=nested_names)
  File "<redacted>/python3.6/site-packages/avro/schema.py", line 1173, in MakeFields
    return tuple(RecordSchema._MakeFieldList(field_desc_list, names))
  File "<redacted>/site-packages/avro/schema.py", line 986, in _MakeFieldList
    yield RecordSchema._MakeField(index, field_desc, names)
  File "<redacted>/python3.6/site-packages/avro/schema.py", line 957, in _MakeField
    names=names,
  File "<redacted>/python3.6/site-packages/avro/schema.py", line 1253, in SchemaFromJSONData
    'Invalid JSON descriptor for an Avro schema: %r.' % json_data)
avro.schema.SchemaParseException: Invalid JSON descriptor for an Avro schema: {'type': 'fixed', 'name': 'Bytes', 'namespace': 'dataset', 'size': 16}.