private DeserializationRuntimeConverter createConverter(LogicalType type) {
        return wrapIntoNullableConverter(createNotNullConverter(type));
    }
Creates a runtime converter which is null safe.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mongodb-cdc/src/main/java/org/apache/inlong/sort/cdc/mongodb/debezium/table/MongoDBConnectorDeserializationSchema.java