[jira] [Created] (AVRO-3842) [Python] Cannot write a record in a union of [map, record]

["Steve Stagg (Jira)" <ji...@apache.org>]

Steve Stagg created AVRO-3842:
---------------------------------

             Summary: [Python] Cannot write a record in a union of [map, record]
                 Key: AVRO-3842
                 URL: https://issues.apache.org/jira/browse/AVRO-3842
             Project: Apache Avro
          Issue Type: Bug
          Components: python
    Affects Versions: 1.11.2, 1.12.0
         Environment: Python 3.10.3
avro 1.11 and 1.12
            Reporter: Steve Stagg


The following script raises a validation exception because the map schema .validate doesn't check the value types, so union schema picks the wrong path, and then raises:

{code:python}
from io import BytesIO
import json
import avro.io
import avro.schema

SCHEMA = [
    {"type": "map", "values": "int"},
    {
        "type": "record",
        "name": "A",
        "fields": [
            {"aliases": [], "type": "string", "name": "x"},
        ],
    },
]

datum = {'x': 'Hello'}

if __name__ == '__main__':
    sch = avro.schema.parse(json.dumps(SCHEMA))
    buf = BytesIO()
    encoder = avro.io.BinaryEncoder(buf)
    writer = avro.io.DatumWriter(sch)
    encoded = writer.write(datum, encoder)
{code}




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