content: /*
   * 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.rel.mutable;
  
  import org.apache.calcite.plan.RelOptCluster;
  import org.apache.calcite.rel.type.RelDataType;
  
  import java.util.List;
  
  /** Mutable equivalent of {@link org.apache.calcite.rel.core.Minus}. */
  public class MutableMinus extends MutableSetOp {
    private MutableMinus(RelOptCluster cluster, RelDataType rowType,
        List<MutableRel> inputs, boolean all) {
      super(cluster, rowType, MutableRelType.MINUS, inputs, all);
    }
  
    /**
     * Creates a MutableMinus.
     *
     * @param rowType Row type
     * @param inputs  Input relational expressions
     * @param all     Whether to perform a multiset subtraction or a set
     *                subtraction
     */
    public static MutableMinus of(
        RelDataType rowType, List<MutableRel> inputs, boolean all) {
      assert inputs.size() >= 2;
      final MutableRel input0 = inputs.get(0);
      return new MutableMinus(input0.cluster, rowType, inputs, all);
    }
  
    @Override public StringBuilder digest(StringBuilder buf) {
      return buf.append("Minus(all: ").append(all).append(")");
    }
  
    @Override public MutableRel clone() {
      return MutableMinus.of(rowType, cloneChildren(), all);
    }
  }
  