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.core;
  
  import org.apache.calcite.linq4j.function.Experimental;
  import org.apache.calcite.plan.RelOptCluster;
  import org.apache.calcite.plan.RelOptTable;
  import org.apache.calcite.plan.RelTraitSet;
  import org.apache.calcite.rel.RelNode;
  import org.apache.calcite.rel.RelWriter;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Spool that writes into a table.
   *
   * <p>NOTE: The current API is experimental and subject to change without
   * notice.
   */
  @Experimental
  public abstract class TableSpool extends Spool {
  
    protected final RelOptTable table;
  
    protected TableSpool(RelOptCluster cluster, RelTraitSet traitSet,
        RelNode input, Type readType, Type writeType, RelOptTable table) {
      super(cluster, traitSet, input, readType, writeType);
      this.table = requireNonNull(table, "table");
    }
  
    @Override public RelOptTable getTable() {
      return table;
    }
  
    @Override public RelWriter explainTerms(RelWriter pw) {
      super.explainTerms(pw);
      return pw.item("table", table.getQualifiedName());
    }
  }
  