org.apache.flink.api.table.expressions.analysis

Class VerifyBoolean

java.lang.Object

org.apache.flink.api.table.trees.Rule<Expression>

org.apache.flink.api.table.expressions.analysis.VerifyBoolean

public class VerifyBoolean
extends Rule<Expression>

Rule that verifies that the result type of an Expression is Boolean. This is required for filter/join predicates.

Constructor Summary

Constructors

Constructor and Description
VerifyBoolean()

Method Summary

Modifier and Type	Method and Description
Expression	apply(Expression expr)

Methods inherited from class java.lang.Object

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

Constructor Detail

VerifyBoolean

public VerifyBoolean()

Method Detail

apply

public Expression apply(Expression expr)

Specified by:

apply in class Rule<Expression>