public void setPartitionKey(String partitionKey) {
        this.partitionKey = partitionKey;
    }
precondition: record is of rowData Type, schema and partitionKey are not null
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/kafka/src/main/java/org/apache/inlong/sort/kafka/partitioner/SingleTableCustomFieldsPartitioner.java