UnresolvedReferenceExpression (Flink : 2.0-preview1 API)

java.lang.Object
- org.apache.flink.table.expressions.UnresolvedReferenceExpression

All Implemented Interfaces:

Serializable, Expression
```
@PublicEvolving
public final class UnresolvedReferenceExpression
extends Object
implements Expression, Serializable
```
An unresolved reference to a field, table, or local reference.
This is a purely API facing expression that will be resolved into FieldReferenceExpression, LocalReferenceExpression, or TableReferenceExpression.

See Also:

Serialized Form

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`<R> R`	`accept(ExpressionVisitor<R> visitor)`
`String`	`asSummaryString()`	Returns a string that summarizes this expression for printing to a console.
`boolean`	`equals(Object o)`
`List<Expression>`	`getChildren()`
`String`	`getName()`
`int`	`hashCode()`
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Method Detail
  - getName
```
public String getName()
```
  - asSummaryString
```
public String asSummaryString()
```
    Description copied from interface: Expression
    
    Returns a string that summarizes this expression for printing to a console. An implementation might skip very specific properties.
    
    Specified by:
    
    asSummaryString in interface Expression
    
    Returns:
    
    summary string of this expression for debugging purposes
  - getChildren
```
public List<Expression> getChildren()
```
    Specified by:
    
    getChildren in interface Expression
  - accept
```
public <R> R accept(ExpressionVisitor<R> visitor)
```
    Specified by:
    
    accept in interface Expression
  - 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