Package org.apache.calcite.rel.rules

Class ProjectToWindowRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.rules.ProjectToWindowRule

Direct Known Subclasses:

ProjectToWindowRule.CalcToWindowRule, ProjectToWindowRule.ProjectToLogicalProjectAndWindowRule

public abstract class ProjectToWindowRule
extends RelOptRule

Planner rule that slices a Project into sections which contain windowed aggregate functions and sections which do not.

The sections which contain windowed agg functions become instances of LogicalWindow. If the LogicalCalc does not contain any windowed agg functions, does nothing.

There is also a variant that matches Calc rather than Project.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ProjectToWindowRule.CalcToWindowRule	Instance of the rule that applies to a Calc that contains windowed aggregates and converts it into a mixture of LogicalWindow and Calc.
static class	ProjectToWindowRule.ProjectToLogicalProjectAndWindowRule	Instance of the rule that can be applied to a Project and that produces, in turn, a mixture of LogicalProject and LogicalWindow.
(package private) static class	ProjectToWindowRule.WindowedAggRelSplitter	Splitter that distinguishes between windowed aggregation expressions (calls to RexOver) and ordinary expressions.

Field Summary

Fields

Modifier and Type	Field	Description
static ProjectToWindowRule	INSTANCE
static ProjectToWindowRule	PROJECT

Fields inherited from class org.apache.calcite.plan.RelOptRule

description, operands, relBuilderFactory

Constructor Summary

Constructors

Constructor	Description
ProjectToWindowRule(RelOptRuleOperand operand, RelBuilderFactory relBuilderFactory, java.lang.String description)	Creates a ProjectToWindowRule.

Method Summary

Methods inherited from class org.apache.calcite.plan.RelOptRule

any, convert, convert, convertList, convertOperand, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, onMatch, operand, operand, operand, operand, operand, operandJ, operandJ, some, toString, unordered

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

INSTANCE

public static final ProjectToWindowRule INSTANCE

PROJECT

public static final ProjectToWindowRule PROJECT

Constructor Detail

ProjectToWindowRule

public ProjectToWindowRule(RelOptRuleOperand operand,
                           RelBuilderFactory relBuilderFactory,
                           java.lang.String description)

Creates a ProjectToWindowRule.

Parameters:

operand - Root operand, must not be null

description - Description, or null to guess description

relBuilderFactory - Builder for relational expressions