Package io.trino.spi.function

Class ValueWindowFunction

java.lang.Object

io.trino.spi.function.ValueWindowFunction

All Implemented Interfaces:

WindowFunction

public abstract class ValueWindowFunction
extends Object
implements WindowFunction

Field Summary

Fields

Modifier and Type	Field	Description
protected WindowIndex	windowIndex

Constructor Summary

Constructors

Constructor	Description
ValueWindowFunction()

Method Summary

Modifier and Type	Method	Description
abstract void	processRow(BlockBuilder output, int frameStart, int frameEnd, int currentPosition)	Process a row by outputting the result of the window function.
final void	processRow(BlockBuilder output, int peerGroupStart, int peerGroupEnd, int frameStart, int frameEnd)	Process a row by outputting the result of the window function.
void	reset()	Reset state for a new partition (including the first one).
final void	reset(WindowIndex windowIndex)	Reset state for a new partition (including the first one).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

windowIndex

protected WindowIndex windowIndex

Constructor Details

ValueWindowFunction

public ValueWindowFunction()

Method Details

reset

public final void reset(WindowIndex windowIndex)

Description copied from interface: WindowFunction

Reset state for a new partition (including the first one).

Specified by:

reset in interface WindowFunction

Parameters:

windowIndex - the window index which contains sorted values for the partition

processRow

public final void processRow(BlockBuilder output,
 int peerGroupStart,
 int peerGroupEnd,
 int frameStart,
 int frameEnd)

Description copied from interface: WindowFunction

Process a row by outputting the result of the window function.

This method provides information about the ordering peer group. A peer group is all of the rows that are peers within the specified ordering. Rows are peers if they compare equal to each other using the specified ordering expression. The ordering of rows within a peer group is undefined (otherwise they would not be peers).

Specified by:

processRow in interface WindowFunction

Parameters:

output - the BlockBuilder to use for writing the output row

peerGroupStart - the position of the first row in the peer group

peerGroupEnd - the position of the last row in the peer group

frameStart - the position of the first row in the window frame

frameEnd - the position of the last row in the window frame

reset

public void reset()

Reset state for a new partition (including the first one).

processRow

public abstract void processRow(BlockBuilder output,
 int frameStart,
 int frameEnd,
 int currentPosition)

Process a row by outputting the result of the window function.

Parameters:

output - the BlockBuilder to use for writing the output row

frameStart - the position of the first row in the window frame

frameEnd - the position of the last row in the window frame

currentPosition - the current position for this row