T
- the type of scan taskspublic interface ScanTaskGroup<T extends ScanTask> extends ScanTask
Modifier and Type | Method and Description |
---|---|
default long |
estimatedRowsCount()
The estimated number of rows produced by this scan task.
|
default int |
filesCount()
The number of files that will be opened by this scan task.
|
default StructLike |
groupingKey()
Returns a grouping key for this task group.
|
default long |
sizeBytes()
The number of bytes that should be read by this scan task.
|
java.util.Collection<T> |
tasks()
Returns scan tasks in this group.
|
asCombinedScanTask, asDataTask, asFileScanTask, isDataTask, isFileScanTask
default StructLike groupingKey()
A grouping key is a set of values that are common amongst all rows produced by the tasks in this task group. The values may be the result of transforming the underlying data. For example, a grouping key can consist of a bucket ordinal computed by applying a bucket transform to a column of the underlying rows. The grouping key type is determined at planning time and is identical across all task groups produced by a scan.
Implementations should return an empty struct if the data grouping is random or unknown.
java.util.Collection<T> tasks()
default long sizeBytes()
ScanTask
default long estimatedRowsCount()
ScanTask
estimatedRowsCount
in interface ScanTask
default int filesCount()
ScanTask
filesCount
in interface ScanTask