/**
* Adds a mapping to store the record field {@code name} in the record key.
*
* <p>The underlying dataset's {@link PartitionStrategy} must have an identity partitioner for
* the record field {@code name} so that the value can be recovered.
*
* @param name The name of a record field
* @return This Builder for method chaining
*/
public Builder key(String name) {
addField(FieldMapping.key(name));
return this;
}
