DeletedDataFileScanTask

All Superinterfaces:

ChangelogScanTask, ContentScanTask<DataFile>, PartitionScanTask, ScanTask, java.io.Serializable
```
public interface DeletedDataFileScanTask
extends ChangelogScanTask, ContentScanTask<DataFile>
```
A scan task for deletes generated by removing a data file from the table.
Note that all historical delete files added earlier must be applied while reading the data file. This is required to output only those data records that were live when the data file was removed.
Suppose snapshot S1 contains data files F1, F2, F3. Then snapshot S2 adds a position delete file, D1, that deletes records from F2 and snapshot S3 removes F2 entirely. A scan for changes generated by S3 should include the following task:
- DeletedDataFileScanTask(file=F2, existing-deletes=[D1], snapshot=S3)
Readers consuming these tasks should produce deleted records with metadata like change ordinal and commit snapshot ID.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`java.util.List<DeleteFile>`	`existingDeletes()`	A list of previously added `delete files` to apply when reading the data file in this task.
`default int`	`filesCount()`	The number of files that will be opened by this scan task.
`default ChangelogOperation`	`operation()`	Returns the type of changes produced by this task (i.e.
`default long`	`sizeBytes()`	The number of bytes that should be read by this scan task.

Methods inherited from interface org.apache.iceberg.ChangelogScanTask
changeOrdinal, commitSnapshotId

Methods inherited from interface org.apache.iceberg.ContentScanTask
estimatedRowsCount, file, length, partition, residual, start

Methods inherited from interface org.apache.iceberg.PartitionScanTask
spec

Methods inherited from interface org.apache.iceberg.ScanTask
asCombinedScanTask, asDataTask, asFileScanTask, isDataTask, isFileScanTask

- Method Detail
  - existingDeletes
```
java.util.List<DeleteFile> existingDeletes()
```
    A list of previously added delete files to apply when reading the data file in this task.
    
    Returns:
    
    a list of delete files to apply
  - operation
```
default ChangelogOperation operation()
```
    Description copied from interface: ChangelogScanTask
    
    Returns the type of changes produced by this task (i.e. insert/delete).
    
    Specified by:
    
    operation in interface ChangelogScanTask
  - sizeBytes
```
default long sizeBytes()
```
    Description copied from interface: ScanTask
    
    The number of bytes that should be read by this scan task.
    
    Specified by:
    
    sizeBytes in interface ContentScanTask<DataFile>
    
    Specified by:
    
    sizeBytes in interface ScanTask
    
    Returns:
    
    the total number of bytes to read
  - filesCount
```
default int filesCount()
```
    Description copied from interface: ScanTask
    
    The number of files that will be opened by this scan task.
    
    Specified by:
    
    filesCount in interface ScanTask
    
    Returns:
    
    the number of files to open