Module com.darkcollective.relix.ast

Package com.darkcollective.relix.ast

Record Class UniversalNode

java.lang.Object

java.lang.Record

com.darkcollective.relix.ast.UniversalNode

Record Components:

groupingAttributes - the attributes to group by; empty for the whole-relation truth form

predicate - the condition every row of a group must satisfy; never null

input - the source relation; never null

location - the source location of this node; never null

All Implemented Interfaces:

RelNode

public record UniversalNode(List<String> groupingAttributes, Predicate predicate, RelNode input, SourceLocation location)
extends Record
implements RelNode

Group-wise universal quantification (∀) — partitions input by the groupingAttributes and keeps the grouping-key tuple of each group in which every row satisfies predicate.

This is the "every row of the group satisfies P" operation that SQL forces into the NOT EXISTS (… NOT P) double-negation — for example, "customers all of whose orders are completed":

∀ customer_id : status = "completed" (Orders)

Strict NULL semantics: a row whose predicate evaluates to UNKNOWN counts as not-satisfied and disqualifies its group (the NOT EXISTS reading, not bool_and).

The output schema is the grouping-key columns only (member rows are recovered with a semi-join back). With no grouping attributes the operator is the whole-relation form ∀ : P (R) — "does every row of R satisfy P?" — whose output is the nullary truth relation (the empty schema, Schema.empty() — relix-symbol, which this module deliberately does not depend on, hence no link): one empty tuple when every row satisfies P (vacuously true on an empty input), no tuple otherwise.

Constructor Summary

Constructors

Constructor	Description
UniversalNode(List<String> groupingAttributes, Predicate predicate, RelNode input)	Convenience constructor for tests; uses SourceLocation.UNKNOWN.
UniversalNode(List<String> groupingAttributes, Predicate predicate, RelNode input, SourceLocation location)	Creates an instance of a UniversalNode 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.
List<String>	groupingAttributes()	Returns the value of the groupingAttributes record component.
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

UniversalNode

public UniversalNode(List<String> groupingAttributes,
 Predicate predicate,
 RelNode input,
 SourceLocation location)

Creates an instance of a UniversalNode record class.

Parameters:

groupingAttributes - the value for the groupingAttributes record component

predicate - the value for the predicate record component

input - the value for the input record component

location - the value for the location record component

UniversalNode

public UniversalNode(List<String> groupingAttributes,
 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.

groupingAttributes

public List<String> groupingAttributes()

Returns the value of the groupingAttributes record component.

Returns:

the value of the groupingAttributes record component

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