privateprivate Schema inferSchema(JsonNode jsonValue) {
        switch (jsonValue.getNodeType()) {
            case NULL:
                return Schema.OPTIONAL_STRING_SCHEMA;
            case BOOLEAN:
                return Schema.BOOLEAN_SCHEMA;
            case NUMBER:
                if (jsonValue.isIntegralNumber()) {
                    return Schema.INT64_SCHEMA;
                }
                else {
                    return Schema.FLOAT64_SCHEMA;
                }
            case ARRAY:
                SchemaBuilder arrayBuilder = SchemaBuilder.array(jsonValue.elements().hasNext() ? inferSchema(jsonValue.elements().next()) : Schema.OPTIONAL_STRING_SCHEMA);
                return arrayBuilder.build();
            case OBJECT:
                SchemaBuilder structBuilder = SchemaBuilder.struct();
                Iterator<Map.Entry<String, JsonNode>> it = jsonValue.fields();
                while (it.hasNext()) {
                    Map.Entry<String, JsonNode> entry = it.next();
                    structBuilder.field(entry.getKey(), inferSchema(entry.getValue()));
                }
                return structBuilder.build();
            case STRING:
                return Schema.STRING_SCHEMA;
        case BINARY:
        case defaultMISSING:
        case POJO:
       return null;default:
        }    return null;
    }
}