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.logical;
  
  import org.apache.calcite.linq4j.function.Experimental;
  import org.apache.calcite.plan.Convention;
  import org.apache.calcite.plan.RelOptCluster;
  import org.apache.calcite.plan.RelOptTable;
  import org.apache.calcite.plan.RelTraitSet;
  import org.apache.calcite.rel.RelCollationTraitDef;
  import org.apache.calcite.rel.RelDistributionTraitDef;
  import org.apache.calcite.rel.RelNode;
  import org.apache.calcite.rel.core.Spool;
  import org.apache.calcite.rel.core.TableSpool;
  import org.apache.calcite.rel.metadata.RelMetadataQuery;
  
  /**
   * Sub-class of {@link TableSpool} not targeted at any particular engine or
   * calling convention.
   *
   * <p>NOTE: The current API is experimental and subject to change without
   * notice.
   */
  @Experimental
  public class LogicalTableSpool extends TableSpool {
  
    //~ Constructors -----------------------------------------------------------
    public LogicalTableSpool(RelOptCluster cluster, RelTraitSet traitSet, RelNode input,
        Type readType, Type writeType, RelOptTable table) {
      super(cluster, traitSet, input, readType, writeType, table);
    }
  
    /** Creates a LogicalTableSpool. */
    public static LogicalTableSpool create(RelNode input, Type readType,
        Type writeType, RelOptTable table) {
      RelOptCluster cluster = input.getCluster();
      RelMetadataQuery mq = cluster.getMetadataQuery();
      RelTraitSet traitSet = cluster.traitSetOf(Convention.NONE)
          .replaceIfs(RelCollationTraitDef.INSTANCE,
              () -> mq.collations(input))
          .replaceIf(RelDistributionTraitDef.INSTANCE,
              () -> mq.distribution(input));
      return new LogicalTableSpool(cluster, traitSet, input, readType, writeType, table);
    }
  
    //~ Methods ----------------------------------------------------------------
  
    @Override protected Spool copy(RelTraitSet traitSet, RelNode input,
        Type readType, Type writeType) {
      return new LogicalTableSpool(input.getCluster(), traitSet, input,
          readType, writeType, table);
    }
  }
  