Package org.apache.calcite.rex

Class RexWindowBound

java.lang.Object

org.apache.calcite.rex.RexWindowBound

Direct Known Subclasses:

RexWindowBound.RexWindowBoundBounded, RexWindowBound.RexWindowBoundCurrentRow, RexWindowBound.RexWindowBoundUnbounded

public abstract class RexWindowBound
extends java.lang.Object

Abstracts "XX PRECEDING/FOLLOWING" and "CURRENT ROW" bounds for windowed aggregates.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	RexWindowBound.RexWindowBoundBounded	Implements XX PRECEDING/FOLLOWING bound where XX is not UNBOUNDED.
private static class	RexWindowBound.RexWindowBoundCurrentRow	Implements CURRENT ROW bound.
private static class	RexWindowBound.RexWindowBoundUnbounded	Implements UNBOUNDED PRECEDING/FOLLOWING bound.

Constructor Summary

Constructors

Constructor	Description
RexWindowBound()

Method Summary

Modifier and Type	Method	Description
<R> RexWindowBound	accept(RexVisitor<R> visitor)	Transforms the bound via RexVisitor.
static RexWindowBound	create(SqlNode node, RexNode rexNode)	Creates window bound.
RexNode	getOffset()	Returns offset from XX PRECEDING/FOLLOWING.
int	getOrderKey()	Returns relative sort offset when known at compile time.
boolean	isCurrentRow()	Returns if the bound is CURRENT ROW.
boolean	isFollowing()	Returns if the bound is FOLLOWING.
boolean	isPreceding()	Returns if the bound is PRECEDING.
boolean	isUnbounded()	Returns if the bound is unbounded.

Methods inherited from class java.lang.Object

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

Constructor Detail

RexWindowBound

public RexWindowBound()

Method Detail

create

public static RexWindowBound create(SqlNode node,
                                    RexNode rexNode)

Creates window bound.

Parameters:

node - SqlNode of the bound

rexNode - offset value when bound is not UNBOUNDED/CURRENT ROW

Returns:

window bound

isUnbounded

public boolean isUnbounded()

Returns if the bound is unbounded.

Returns:

if the bound is unbounded

isPreceding

public boolean isPreceding()

Returns if the bound is PRECEDING.

Returns:

if the bound is PRECEDING

isFollowing

public boolean isFollowing()

Returns if the bound is FOLLOWING.

Returns:

if the bound is FOLLOWING

isCurrentRow

public boolean isCurrentRow()

Returns if the bound is CURRENT ROW.

Returns:

if the bound is CURRENT ROW

getOffset

public RexNode getOffset()

Returns offset from XX PRECEDING/FOLLOWING.

Returns:

offset from XX PRECEDING/FOLLOWING

getOrderKey

public int getOrderKey()

Returns relative sort offset when known at compile time. For instance, UNBOUNDED PRECEDING is less than CURRENT ROW.

Returns:

relative order or -1 when order is not known

accept

public <R> RexWindowBound accept(RexVisitor<R> visitor)

Transforms the bound via RexVisitor.

Type Parameters:

R - return type of the visitor

Parameters:

visitor - visitor to accept

Returns:

transformed bound