protected StructLikeWrapper lazyStructLikeWrapper() {
        if (structLikeWrapper == null) {
            structLikeWrapper = StructLikeWrapper.forType(deleteSchema.asStruct());
        }
        return structLikeWrapper;
    }
Construct the {@link StructLikeWrapper} lazily because it is not serializable.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/iceberg/src/main/java/org/apache/inlong/sort/iceberg/sink/EqualityFieldKeySelector.java