ExpressionUtils (Flink : 2.0-SNAPSHOT API)

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

@Internal
public final class ExpressionUtils
extends Object

Utility methods for working with Expressions.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static <V> Optional<V>`	`extractValue(Expression expression, Class<V> targetClass)`	Extracts the value (excluding null) of a given class from an expression assuming it is a `ValueLiteralExpression`.

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

- Method Detail
  - extractValue
```
public static <V> Optional<V> extractValue(Expression expression,
                                           Class<V> targetClass)
```
    Extracts the value (excluding null) of a given class from an expression assuming it is a ValueLiteralExpression.
    
    Type Parameters:
    
    V - type of extracted value
    
    Parameters:
    
    expression - literal to extract the value from
    
    targetClass - expected class to extract from the literal
    
    Returns:
    
    extracted value or empty if could not extract value of given type