protected RowDataWrapper lazyRowDataWrapper() {
        if (rowDataWrapper == null) {
            rowDataWrapper = new RowDataWrapper(flinkSchema, schema.asStruct());
        }
        return rowDataWrapper;
    }
Construct the {@link RowDataWrapper} lazily here because few members in it are not
serializable. In this way, we don't have to serialize them with forcing.
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/iceberg/src/main/java/org/apache/inlong/sort/iceberg/sink/EqualityFieldKeySelector.java