Gang Wu created AVRO-4351:
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Summary: [C++] Preserve custom attributes on primitive schemas
during JSON round-trip
Key: AVRO-4351
URL: https://issues.apache.org/jira/browse/AVRO-4351
Project: Apache Avro
Issue Type: Bug
Components: c++
Reporter: Gang Wu
Assignee: Gang Wu
Avro C++ does not currently preserve custom attributes attached directly to
primitive schema objects during a JSON schema round-trip.
For example:
{code:java}
{
"type": "long",
"logicalType": "timestamp-micros",
"adjust-to-utc": true
}
{code}
The schema compiler ignores unknown properties on primitive schema objects, and
NodePrimitive::printJson does not serialize primitive custom attributes. As a
result, adjust-to-utc and other custom properties are lost after parsing or
serializing the schema.
This affects integrations that rely on Avro schema properties. In particular,
the Iceberg Avro serialization rules use adjust-to-utc to distinguish timestamp
from timestamptz while representing both as long with the timestamp-micros
logical type. Losing this property can cause timestamptz to be interpreted as
timestamp.
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