org.apache.iceberg

Interface ContentScanTask<F extends ContentFile<F>>

Type Parameters:

F - the Java class of the content file

All Superinterfaces:

PartitionScanTask, ScanTask, java.io.Serializable

All Known Subinterfaces:

AddedRowsScanTask, DataTask, DeletedDataFileScanTask, DeletedRowsScanTask, FileScanTask

All Known Implementing Classes:

BaseFileScanTask

public interface ContentScanTask<F extends ContentFile<F>>
extends ScanTask, PartitionScanTask

A scan task over a range of bytes in a content file.

Method Summary

Modifier and Type	Method and Description
default long	estimatedRowsCount() The estimated number of rows produced by this scan task.
F	file() The file to scan.
long	length() The number of bytes to scan from the start() position in the file.
default StructLike	partition() Returns the value of the partition for this scan task
Expression	residual() Returns the residual expression that should be applied to rows in this file scan.
long	start() The starting position of this scan range in the file.

Methods inherited from interface org.apache.iceberg.PartitionScanTask

spec

Methods inherited from interface org.apache.iceberg.ScanTask

asCombinedScanTask, asDataTask, asFileScanTask, filesCount, isDataTask, isFileScanTask, sizeBytes

Method Detail

file

F file()

The file to scan.

Returns:

the file to scan

partition

default StructLike partition()

Description copied from interface: PartitionScanTask

Returns the value of the partition for this scan task

Specified by:

partition in interface PartitionScanTask

start

long start()

The starting position of this scan range in the file.

Returns:

the start position of this scan range

length

long length()

The number of bytes to scan from the start() position in the file.

Returns:

the length of this scan range in bytes

residual

Expression residual()

Returns the residual expression that should be applied to rows in this file scan.

The residual expression for a file is a filter expression created by partially evaluating the scan's filter using the file's partition data.

Returns:

a residual expression to apply to rows from this scan

estimatedRowsCount

default long estimatedRowsCount()

Description copied from interface: ScanTask

The estimated number of rows produced by this scan task.

Specified by:

estimatedRowsCount in interface ScanTask

Returns:

the estimated number of produced rows