org.apache.calcite.plan

Class SubstitutionVisitor.QueryOperand

java.lang.Object

org.apache.calcite.plan.SubstitutionVisitor.Operand

org.apache.calcite.plan.SubstitutionVisitor.QueryOperand

Enclosing class:

SubstitutionVisitor

private static class SubstitutionVisitor.QueryOperand
extends SubstitutionVisitor.Operand

Operand that assigns a particular relational expression to a variable.

It is applied to a descendant of the query, writes the operand into the slots array, and always matches. There is a corresponding operand of type SubstitutionVisitor.TargetOperand that checks whether its relational expression, a descendant of the target, is equivalent to this QueryOperand's relational expression.

Field Summary

Fields

Modifier and Type	Field and Description
private int	ordinal

Fields inherited from class org.apache.calcite.plan.SubstitutionVisitor.Operand

clazz

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	QueryOperand(int ordinal)

Method Summary

Modifier and Type	Method and Description
boolean	matches(SubstitutionVisitor visitor, MutableRel rel)

Methods inherited from class org.apache.calcite.plan.SubstitutionVisitor.Operand

isWeaker

Methods inherited from class java.lang.Object

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

Field Detail

ordinal

private final int ordinal

Constructor Detail

QueryOperand

protected QueryOperand(int ordinal)

Method Detail

matches

public boolean matches(SubstitutionVisitor visitor,
                       MutableRel rel)

Specified by:

matches in class SubstitutionVisitor.Operand