T- The type of the record.
public static interface BulkFormat.RecordIterator<T>
@Nullable RecordAndPosition<T> next()
The position information returned with the record point to the record AFTER the returned record, because it defines the point where the reading should resume once the current record is emitted. The position information is put in the source's state when the record is emitted. If a checkpoint is taken directly after the record is emitted, the checkpoint must to describe where to resume the source reading from after that record.
Objects returned by this method may be reused by the iterator. By the time that this
method is called again, no object returned from the previous call will be referenced any more.
That makes it possible to have a single
MutableRecordAndPosition object and return the
same instance (with updated record and position) on every call.
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