gudusoft.gsqlparser.ir.semantic.joinanalysis

Class Predicate

Object

gudusoft.gsqlparser.ir.semantic.joinanalysis.Predicate

public final class Predicate
extends Object

A single conjunct extracted from an ON or WHERE condition (GAP 2). A predicate is the binary shape left <operator> right, except for PredicateKind.NULL_CHECK (which has only a left operand) and PredicateKind.COMPLEX (which preserves an undecomposed sub-tree, typically with a single operand).

• operator is the verbatim comparison token (=, <>, >, IS NULL, IS NOT NULL, BETWEEN, ...). May be null for a PredicateKind.COMPLEX predicate.
• leftOperand is non-null.
• rightOperand is null for PredicateKind.NULL_CHECK and may be null for PredicateKind.COMPLEX.
• sourceSpan covers the whole predicate; null when the parser cannot anchor it.

Immutable. Introduced by join-analysis slice 162 (S1); produced by PredicateTreeBuilder in slice 166 (S5).

Constructor Summary

Constructors

Constructor and Description
Predicate(PredicateKind kind, String operator, PredicateOperand leftOperand, PredicateOperand rightOperand, SourceSpan sourceSpan)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
PredicateKind	getKind()
PredicateOperand	getLeftOperand()
String	getOperator() Verbatim comparison token; may be null for COMPLEX.
PredicateOperand	getRightOperand() Null for NULL_CHECK; may be null for COMPLEX.
SourceSpan	getSourceSpan() Optional; null when the parser cannot anchor this predicate.
int	hashCode()
String	toString()

Methods inherited from class Object

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

Constructor Detail

Predicate

public Predicate(PredicateKind kind,
                 String operator,
                 PredicateOperand leftOperand,
                 PredicateOperand rightOperand,
                 SourceSpan sourceSpan)

Method Detail

getKind

public PredicateKind getKind()

getOperator

public String getOperator()

Verbatim comparison token; may be null for COMPLEX.

getLeftOperand

public PredicateOperand getLeftOperand()

getRightOperand

public PredicateOperand getRightOperand()

Null for NULL_CHECK; may be null for COMPLEX.

getSourceSpan

public SourceSpan getSourceSpan()

Optional; null when the parser cannot anchor this predicate.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object