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.adapter.enumerable;
  
  import org.apache.calcite.plan.Convention;
  import org.apache.calcite.rel.RelNode;
  import org.apache.calcite.rel.convert.ConverterRule;
  import org.apache.calcite.rel.core.Collect;
  
  /**
   * Rule to convert an {@link org.apache.calcite.rel.core.Collect} to an
   * {@link EnumerableCollect}.
   *
   * @see EnumerableRules#ENUMERABLE_COLLECT_RULE
   */
  class EnumerableCollectRule extends ConverterRule {
    /** Default configuration. */
    public static final Config DEFAULT_CONFIG = Config.INSTANCE
        .withConversion(Collect.class, Convention.NONE,
            EnumerableConvention.INSTANCE, "EnumerableCollectRule")
        .withRuleFactory(EnumerableCollectRule::new);
  
    /** Called from the Config. */
    protected EnumerableCollectRule(Config config) {
      super(config);
    }
  
    @Override public RelNode convert(RelNode rel) {
      final Collect collect = (Collect) rel;
      final RelNode input = collect.getInput();
      return EnumerableCollect.create(
          convert(input,
              input.getTraitSet().replace(EnumerableConvention.INSTANCE)),
          collect.getRowType());
    }
  }
  