SubstitutionVisitor.QueryOperand (Apache Calcite API)

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 Description
  
  private int ordinal
  - Fields inherited from class org.apache.calcite.plan.SubstitutionVisitor.Operand
    clazz
- Constructor Summary
  
  Constructors
  Modifier Constructor Description
  
  protected QueryOperand(int ordinal)
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method 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