Module com.darkcollective.relix.plan

Package com.darkcollective.relix.plan

Record Class PhysicalNode.Empty

java.lang.Object

java.lang.Record

com.darkcollective.relix.plan.PhysicalNode.Empty

All Implemented Interfaces:

PhysicalNode

Enclosing interface:

PhysicalNode

public static record PhysicalNode.Empty(Schema schema)
extends Record
implements PhysicalNode

Produces no rows at all, under schema's heading — the physical form of EmptyRelationNode, planted by the optimizer where a sub-tree was proved unsatisfiable.

The point of the node is what it does not contain: the sub-plan it replaced is gone, so nothing under it is scanned, joined or aggregated. That is the whole win — a contradictory filter costs one empty stream rather than a full scan and everything above it.

Nested Class Summary

Nested classes/interfaces inherited from interface com.darkcollective.relix.plan.PhysicalNode

PhysicalNode.Aggregate, PhysicalNode.AsOfJoin, PhysicalNode.BernoulliSample, PhysicalNode.BuildSide, PhysicalNode.Closure, PhysicalNode.Cluster, PhysicalNode.ConstructiveCover, PhysicalNode.Cover, PhysicalNode.Distinct, PhysicalNode.Division, PhysicalNode.Downsample, PhysicalNode.Empty, PhysicalNode.Fixpoint, PhysicalNode.IntervalJoin, PhysicalNode.Iterate, PhysicalNode.Join, PhysicalNode.JoinAlgorithm, PhysicalNode.JoinKeys, PhysicalNode.JoinKind, PhysicalNode.LateralJoin, PhysicalNode.Limit, PhysicalNode.Optimize, PhysicalNode.Path, PhysicalNode.Pivot, PhysicalNode.Project, PhysicalNode.PushedScan, PhysicalNode.RecursiveRef, PhysicalNode.Rename, PhysicalNode.ReservoirSample, PhysicalNode.Scan, PhysicalNode.Select, PhysicalNode.Sessionize, PhysicalNode.SetKind, PhysicalNode.SetOp, PhysicalNode.Solve, PhysicalNode.Sort, PhysicalNode.Spool, PhysicalNode.TopK, PhysicalNode.Trace, PhysicalNode.Tree, PhysicalNode.Universal, PhysicalNode.Unnest, PhysicalNode.Unpivot, PhysicalNode.Why, PhysicalNode.Window

Constructor Summary

Constructors

Constructor	Description
Empty(Schema schema)	Creates an instance of a Empty record class.

Method Summary

Modifier and Type	Method	Description
List<PhysicalNode>	children()	Direct child plans, left-to-right; empty for a PhysicalNode.Scan.
final boolean	equals(Object o)	Indicates whether some other object is "equal to" this one.
final int	hashCode()	Returns a hash code value for this object.
Schema	schema()	Returns the value of the schema record component.
final String	toString()	Returns a string representation of this record class.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.darkcollective.relix.plan.PhysicalNode

deliveredOrdering, mapChildren

Constructor Details

Empty

public Empty(Schema schema)

Creates an instance of a Empty record class.

Parameters:

schema - the value for the schema record component

Method Details

children

public List<PhysicalNode> children()

Description copied from interface: PhysicalNode

Direct child plans, left-to-right; empty for a PhysicalNode.Scan.

Specified by:

children in interface PhysicalNode

toString

public final String toString()

Returns a string representation of this record class. The representation contains the name of the class, followed by the name and value of each of the record components.

Specified by:

toString in class Record

Returns:

a string representation of this object

hashCode

public final int hashCode()

Returns a hash code value for this object. The value is derived from the hash code of each of the record components.

Specified by:

hashCode in class Record

Returns:

a hash code value for this object

equals

public final boolean equals(Object o)

Indicates whether some other object is "equal to" this one. The objects are equal if the other object is of the same class and if all the record components are equal. All components in this record class are compared with Objects::equals(Object,Object).

Specified by:

equals in class Record

Parameters:

o - the object with which to compare

Returns:

true if this object is the same as the o argument; false otherwise.

schema

public Schema schema()

Returns the value of the schema record component.

Specified by:

schema in interface PhysicalNode

Returns:

the value of the schema record component