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Core Calcite APIs and engine.
/*
* 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 compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.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 org.apache.calcite.plan;
/**
* Trait for which a given relational expression can have multiple values.
*
* The most common example is sorted-ness (collation). The TIME dimension
* table might be sorted by [year, month, date] and also by [time_id].
*/
public interface RelMultipleTrait
extends RelTrait, Comparable {
/** Returns whether this trait is satisfied by every instance of the trait
* (including itself). */
boolean isTop();
}
// End RelMultipleTrait.java