Module com.darkcollective.relix.ast

Package com.darkcollective.relix.ast

Record Class SelectionNode

java.lang.Object

java.lang.Record

com.darkcollective.relix.ast.SelectionNode

Record Components:

predicate - the filter condition; must not be null

input - the relation to filter; must not be null

location - the source location of this node; never null

All Implemented Interfaces:

RelNode

public record SelectionNode(Predicate predicate, RelNode input, SourceLocation location)
extends Record
implements RelNode

Selection (σ) — filters the tuples of input to those satisfying predicate.

Example: σ age > 18 (Users)

Constructor Summary

Constructors

Constructor	Description
SelectionNode(Predicate predicate, RelNode input)	Convenience constructor for tests; uses SourceLocation.UNKNOWN.
SelectionNode(Predicate predicate, RelNode input, SourceLocation location)	Creates an instance of a SelectionNode record class.

Method Summary

Modifier and Type	Method	Description
<R> R	accept(RelNodeVisitor<R> visitor)
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.
RelNode	input()	Returns the value of the input record component.
SourceLocation	location()	Returns the value of the location record component.
Predicate	predicate()	Returns the value of the predicate 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.ast.RelNode

children, mapChildren, materializationMode, prettyPrint

Constructor Details

SelectionNode

public SelectionNode(Predicate predicate,
 RelNode input,
 SourceLocation location)

Creates an instance of a SelectionNode record class.

Parameters:

predicate - the value for the predicate record component

input - the value for the input record component

location - the value for the location record component

SelectionNode

public SelectionNode(Predicate predicate,
 RelNode input)

Convenience constructor for tests; uses SourceLocation.UNKNOWN.

Method Details

accept

public <R> R accept(RelNodeVisitor<R> visitor)

Specified by:

accept in interface RelNode

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.

predicate

public Predicate predicate()

Returns the value of the predicate record component.

Returns:

the value of the predicate record component

input

public RelNode input()

Returns the value of the input record component.

Returns:

the value of the input record component

location

public SourceLocation location()

Returns the value of the location record component.

Specified by:

location in interface RelNode

Returns:

the value of the location record component