Package io.trino.sql.planner.iterative.rule

Class GatherAndMergeWindows.MergeAdjacentWindowsOverProjects

java.lang.Object

io.trino.sql.planner.iterative.rule.GatherAndMergeWindows.MergeAdjacentWindowsOverProjects

All Implemented Interfaces:

Rule<WindowNode>

Enclosing class:

GatherAndMergeWindows

public static class GatherAndMergeWindows.MergeAdjacentWindowsOverProjects
extends Object

Nested Class Summary

Nested classes/interfaces inherited from interface io.trino.sql.planner.iterative.Rule

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
MergeAdjacentWindowsOverProjects(int numProjects)

Method Summary

Modifier and Type	Method	Description
Rule.Result	apply(WindowNode parent, Captures captures, Rule.Context context)
Pattern<WindowNode>	getPattern()	Returns a pattern to which plan nodes this rule applies.
protected Optional<PlanNode>	manipulateAdjacentWindowNodes(WindowNode parent, WindowNode child, Rule.Context context)
protected static Optional<WindowNode>	pullWindowNodeAboveProjects(WindowNode target, List<ProjectNode> projects)	Looks for the pattern (ProjectNode*)WindowNode, and rewrites it to WindowNode(ProjectNode*), returning an empty option if it can't rewrite the projects, for example because they rely on the output of the WindowNode.

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.trino.sql.planner.iterative.Rule

isEnabled

Constructor Details

MergeAdjacentWindowsOverProjects

public MergeAdjacentWindowsOverProjects(int numProjects)

Method Details

manipulateAdjacentWindowNodes

protected Optional<PlanNode> manipulateAdjacentWindowNodes(WindowNode parent,
 WindowNode child,
 Rule.Context context)

getPattern

public Pattern<WindowNode> getPattern()

Description copied from interface: Rule

Returns a pattern to which plan nodes this rule applies.

Specified by:

getPattern in interface Rule<WindowNode>

apply

public Rule.Result apply(WindowNode parent,
 Captures captures,
 Rule.Context context)

Specified by:

apply in interface Rule<WindowNode>

pullWindowNodeAboveProjects

protected static Optional<WindowNode> pullWindowNodeAboveProjects(WindowNode target,
 List<ProjectNode> projects)

Looks for the pattern (ProjectNode*)WindowNode, and rewrites it to WindowNode(ProjectNode*), returning an empty option if it can't rewrite the projects, for example because they rely on the output of the WindowNode.

Parameters:

projects - the nodes above the target, bottom first.