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.interpreter;
  
  import org.apache.calcite.plan.Convention;
  import org.apache.calcite.plan.RelTraitSet;
  import org.apache.calcite.rel.RelNode;
  import org.apache.calcite.rel.convert.ConverterRule;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /**
   * Rule to convert a relational expression from
   * {@link org.apache.calcite.plan.Convention#NONE}
   * to {@link org.apache.calcite.interpreter.BindableConvention}.
   *
   * @see Bindables#FROM_NONE_RULE
   */
  public class NoneToBindableConverterRule extends ConverterRule {
    /** Default configuration. */
    public static final Config DEFAULT_CONFIG = Config.INSTANCE
        .withConversion(RelNode.class, Convention.NONE,
            BindableConvention.INSTANCE, "NoneToBindableConverterRule")
        .withRuleFactory(NoneToBindableConverterRule::new);
  
    /** Called from the Config. */
    protected NoneToBindableConverterRule(Config config) {
      super(config);
    }
  
    @Override public @Nullable RelNode convert(RelNode rel) {
      RelTraitSet newTraitSet = rel.getTraitSet().replace(getOutConvention());
      return new InterpretableConverter(rel.getCluster(), newTraitSet, rel);
    }
  }
  