org.apache.flink.table.expressions

Class ExpressionUtils

java.lang.Object

org.apache.flink.table.expressions.ExpressionUtils

@Internal
public final class ExpressionUtils
extends Object

Utility methods for working with Expressions.

Method Summary

Modifier and Type	Method and 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