@Override
    public TypeInformation<OUT> getProducedType() {
        return deserializationSchema.getProducedType();
    }
Get a PulsarSourceBuilder to builder a {@link PulsarSource}.

@return a Pulsar source builder.
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/pulsar/src/main/java/org/apache/inlong/sort/pulsar/source/PulsarSource.java