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Calcite APIs for LINQ (Language-Integrated Query) in Java

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/*
 * 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.linq4j.function;

/**
 * Function with one parameter returning a native {@code boolean} value.
 *
 * @param  Type of argument #0
 */
public interface Predicate1 extends Function {
  /**
   * Predicate that always evaluates to {@code true}.
   *
   * @see Functions#truePredicate1()
   */
  Predicate1