org.apache.calcite.rel.rules

Class ProjectToWindowRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.rules.ProjectToWindowRule

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.

Field Summary

Fields

Modifier and Type	Field and Description
static ProjectToWindowRule	INSTANCE Instance of the rule that applies to a Calc that contains windowed aggregates and converts it into a mixture of LogicalWindow and Calc.
static ProjectToWindowRule	PROJECT Instance of the rule that can be applied to a Project and that produces, in turn, a mixture of LogicalProject and LogicalWindow.

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

description, operands

Method Summary

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

any, convert, convert, convertList, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, onMatch, operand, operand, operand, operand, operand, 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

Instance of the rule that applies to a Calc that contains windowed aggregates and converts it into a mixture of LogicalWindow and Calc.

PROJECT

public static final ProjectToWindowRule PROJECT

Instance of the rule that can be applied to a Project and that produces, in turn, a mixture of LogicalProject and LogicalWindow.