public void setMetricData(SinkTopicMetricData metricData) {
        this.metricData = metricData;
    }
Contains the position for each value of {@link WritableMetadata} in the
consumed row or -1 if this metadata key is not used.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/kafka/src/main/java/org/apache/inlong/sort/kafka/DynamicKafkaSerializationSchema.java