sijie opened a new pull request #2452: [Schema] Provide a generic record interface for representing a typed message URL: https://github.com/apache/incubator-pulsar/pull/2452 ### Motivation In some use cases, the publishers and consumers don't know the type or schema of the messages ahead of time. For example, in pulsar io connector, when connecting a topic to a jdbc table, the connector doesn't know the tyep of the messages ahead of time; the connector can only fetch schema info from schema registry and that is the only information connector knows. It is impossible for mapping the messages to a relational database table. So we need a way to present a generic `Struct` record with fields. ### Changes Introduce `Field` and `GenericRecord` to represent `Struct` records deserialized with a schema. ### NotCovered This change only introduces the interfaces. It doesn't integrate with the producer and consumer workflow. That would be done in subsequent changes if we agree on the interfaces.
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