Package io.trino.operator.window.pattern

Class ProjectingPagesWindowIndex

java.lang.Object

io.trino.operator.window.pattern.ProjectingPagesWindowIndex

All Implemented Interfaces:

WindowIndex

public class ProjectingPagesWindowIndex
extends Object
implements WindowIndex

This class represents a WindowIndex with additional "channels" which are not part of the underlying PagesIndex.

The purpose of this class is to provide input for aggregations in a consistent way, regardless of whether the aggregation uses an input channel, or a runtime-evaluated expression as the argument.

The latter case applies to aggregate functions within the DEFINE and MEASURES clauses of row pattern recognition. The aggregated argument can be based on CLASSIFIER() or MATCH_NUMBER() results which are not present in the input, and thus needs to be evaluated at runtime while processing a row.

E.g. for the aggregate function array_agg(lower(CLASSIFIER(X))), there is no input channel containing the aggregated argument, so it is evaluated row by row at runtime and passed in an additional "channel" available to the aggregation's accumulator by a standard WindowIndex interface.

Constructor Summary

Constructors

Constructor	Description
ProjectingPagesWindowIndex(PagesIndex pagesIndex, int start, int end, List<ArgumentComputation> projections, List<String> labelNames)

Method Summary

Modifier and Type	Method	Description
void	appendTo(int channel, int position, BlockBuilder output)
boolean	getBoolean(int channel, int position)
double	getDouble(int channel, int position)
long	getLong(int channel, int position)
Object	getObject(int channel, int position)
Block	getSingleValueBlock(int channel, int position)
io.airlift.slice.Slice	getSlice(int channel, int position)
boolean	isNull(int channel, int position)
void	setLabelAndMatchNumber(int currentPosition, int label, long matchNumber)
int	size()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

ProjectingPagesWindowIndex

public ProjectingPagesWindowIndex(PagesIndex pagesIndex,
                                  int start,
                                  int end,
                                  List<ArgumentComputation> projections,
                                  List<String> labelNames)

Method Detail

setLabelAndMatchNumber

public void setLabelAndMatchNumber(int currentPosition,
                                   int label,
                                   long matchNumber)

size

public int size()

Specified by:

size in interface WindowIndex

isNull

public boolean isNull(int channel,
                      int position)

Specified by:

isNull in interface WindowIndex

getBoolean

public boolean getBoolean(int channel,
                          int position)

Specified by:

getBoolean in interface WindowIndex

getLong

public long getLong(int channel,
                    int position)

Specified by:

getLong in interface WindowIndex

getDouble

public double getDouble(int channel,
                        int position)

Specified by:

getDouble in interface WindowIndex

getSlice

public io.airlift.slice.Slice getSlice(int channel,
                                       int position)

Specified by:

getSlice in interface WindowIndex

getSingleValueBlock

public Block getSingleValueBlock(int channel,
                                 int position)

Specified by:

getSingleValueBlock in interface WindowIndex

getObject

public Object getObject(int channel,
                        int position)

Specified by:

getObject in interface WindowIndex

appendTo

public void appendTo(int channel,
                     int position,
                     BlockBuilder output)

Specified by:

appendTo in interface WindowIndex

toString

public String toString()

Overrides:

toString in class Object