com.hazelcast.org.apache.calcite.rel.InvalidRelException Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in com.hazelcast.com.liance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.org.licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.org.apache.calcite.rel;
/**
* Exception that indicates that a relational expression would be invalid
* with given parameters.
*
* This exception is thrown by the constructor of a subclass of
* {@link RelNode} when given parameters it cannot accept. For example,
* {@code EnumerableJoinRel} can only implement equi-joins, so its constructor
* throws {@code InvalidRelException} when given the condition
* {@code input0.x - input1.y = 2}.
*
* Because the exception is checked (i.e. extends {@link Exception} but not
* {@link RuntimeException}), constructors that throw this exception will
* declare this exception in their {@code throws} clause, and rules that create
* those relational expressions will need to handle it. Usually a rule will
* not take the exception personally, and will fail to match. The burden of
* checking is removed from the rule, which means less code for the author of
* the rule to maintain.
*
* The caller that receives an {@code InvalidRelException} (typically a rule
* attempting to create a relational expression) should log it at
* the DEBUG level.
*/
public class InvalidRelException extends Exception {
/**
* Creates an InvalidRelException.
*/
public InvalidRelException(String message) {
super(message);
}
/**
* Creates an InvalidRelException with a cause.
*/
public InvalidRelException(String message, Throwable cause) {
super(message, cause);
}
}