Package net.hydromatic.morel.ast

Class Core.SetStep

java.lang.Object

net.hydromatic.morel.ast.AstNode

net.hydromatic.morel.ast.Core.BaseNode

net.hydromatic.morel.ast.Core.FromStep

net.hydromatic.morel.ast.Core.SetStep

Direct Known Subclasses:

Core.Except, Core.Intersect, Core.Union

Enclosing class:

Core

public abstract static class Core.SetStep
extends Core.FromStep

Base class of Core.Except, Core.Intersect, Core.Union.

Field Summary

Fields

Modifier and Type	Field	Description
final com.google.common.collect.ImmutableList<Core.Exp>	args
final boolean	distinct

Fields inherited from class net.hydromatic.morel.ast.Core.FromStep

env

Fields inherited from class net.hydromatic.morel.ast.AstNode

op, pos

Constructor Summary

Constructors

Constructor	Description
SetStep(Op op, Core.StepEnv env, boolean distinct, com.google.common.collect.ImmutableList<Core.Exp> args)

Method Summary

Modifier and Type	Method	Description
abstract Core.SetStep	copy(boolean distinct, List<Core.Exp> args, Core.StepEnv env)
boolean	isOrdered(boolean inputIsOrdered)	Returns whether the output of this step is ordered, given whether the input is ordered.
protected AstWriter	unparse(AstWriter w, Core.From from, int ordinal, int left, int right)

Methods inherited from class net.hydromatic.morel.ast.Core.FromStep

accept, unparse

Methods inherited from class net.hydromatic.morel.ast.Core.BaseNode

accept

Methods inherited from class net.hydromatic.morel.ast.AstNode

toString, unparse

Methods inherited from class java.lang.Object

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

Field Details

distinct

public final boolean distinct

args

public final com.google.common.collect.ImmutableList<Core.Exp> args

Constructor Details

SetStep

SetStep(Op op,
 Core.StepEnv env,
 boolean distinct,
 com.google.common.collect.ImmutableList<Core.Exp> args)

Method Details

unparse

protected AstWriter unparse(AstWriter w,
 Core.From from,
 int ordinal,
 int left,
 int right)

Specified by:

unparse in class Core.FromStep

copy

public abstract Core.SetStep copy(boolean distinct,
 List<Core.Exp> args,
 Core.StepEnv env)

isOrdered

public boolean isOrdered(boolean inputIsOrdered)

Description copied from class: Core.FromStep

Returns whether the output of this step is ordered, given whether the input is ordered.

For example, Core.Where and Core.Yield are ordered if and only if their input is ordered; Core.Order is always ordered; Core.Group is unordered.

Overrides:

isOrdered in class Core.FromStep