Package io.trino.operator.window.pattern

Class LogicalIndexNavigation

java.lang.Object

io.trino.operator.window.pattern.LogicalIndexNavigation

public class LogicalIndexNavigation
extends Object

Constructor Summary

Constructors

Constructor	Description
LogicalIndexNavigation(Set<Integer> labels, boolean last, boolean running, int logicalOffset, int physicalOffset)

Method Summary

Modifier and Type	Method	Description
int	resolvePosition(int currentRow, ArrayView matchedLabels, int partitionStart, int partitionEnd, int patternStart)	This method is used when computing row pattern measures and SKIP TO position after finding a match.
int	resolvePosition(ArrayView matchedLabels, int newLabel, int partitionStart, int partitionEnd, int patternStart)	This method is used for resolving positions during pattern matching.

Methods inherited from class java.lang.Object

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

Constructor Detail

LogicalIndexNavigation

public LogicalIndexNavigation(Set<Integer> labels,
                              boolean last,
                              boolean running,
                              int logicalOffset,
                              int physicalOffset)

Method Detail

resolvePosition

public int resolvePosition(ArrayView matchedLabels,
                           int newLabel,
                           int partitionStart,
                           int partitionEnd,
                           int patternStart)

This method is used for resolving positions during pattern matching. The `newLabel` is the label currently being matched. For the purpose of match evaluation, the new label is considered as matched in the next position after all `matchedLabels`.

Returns:

position within partition, or -1 if matching position was not found

resolvePosition

public int resolvePosition(int currentRow,
                           ArrayView matchedLabels,
                           int partitionStart,
                           int partitionEnd,
                           int patternStart)

This method is used when computing row pattern measures and SKIP TO position after finding a match. Array of matched labels is complete. Search is limited up to the current row in case of running semantics and to the entire match in case of final semantics.

Returns:

position within partition, or -1 if matching position was not found