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.beam.sdk.extensions.sql.impl.rule;
  
  import org.apache.beam.sdk.extensions.sql.impl.rel.BeamEnumerableConverter;
  import org.apache.beam.sdk.extensions.sql.impl.rel.BeamLogicalConvention;
  import org.apache.beam.sdk.extensions.sql.impl.rel.BeamRelNode;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.adapter.enumerable.EnumerableConvention;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.plan.RelTraitSet;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.RelNode;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.convert.ConverterRule;
  
  /** A {@code ConverterRule} to Convert {@link BeamRelNode} to {@link EnumerableConvention}. */
  public class BeamEnumerableConverterRule extends ConverterRule {
    public static final BeamEnumerableConverterRule INSTANCE = new BeamEnumerableConverterRule();
  
    private BeamEnumerableConverterRule() {
      super(
          RelNode.class,
          BeamLogicalConvention.INSTANCE,
          EnumerableConvention.INSTANCE,
          "BeamEnumerableConverterRule");
    }
  
    @Override
    public RelNode convert(RelNode rel) {
      RelTraitSet newTraitSet = rel.getTraitSet().replace(getOutTrait());
      return new BeamEnumerableConverter(rel.getCluster(), newTraitSet, rel);
    }
  }
  