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.DataContext;
  import org.apache.calcite.linq4j.Enumerable;
  import org.apache.calcite.plan.ConventionTraitDef;
  import org.apache.calcite.plan.RelOptCluster;
  import org.apache.calcite.plan.RelTraitSet;
  import org.apache.calcite.rel.RelNode;
  import org.apache.calcite.rel.convert.ConverterImpl;
  import org.apache.calcite.runtime.ArrayBindable;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  
  /**
   * Relational expression that converts any relational expression input to
   * {@link org.apache.calcite.interpreter.InterpretableConvention}, by wrapping
   * it in an interpreter.
   */
  public class InterpretableConverter extends ConverterImpl
      implements ArrayBindable {
    protected InterpretableConverter(RelOptCluster cluster, RelTraitSet traits,
        RelNode input) {
      super(cluster, ConventionTraitDef.INSTANCE, traits, input);
    }
  
    @Override public RelNode copy(RelTraitSet traitSet, List<RelNode> inputs) {
      return new InterpretableConverter(getCluster(), traitSet, sole(inputs));
    }
  
    @Override public Class<Object[]> getElementType() {
      return Object[].class;
    }
  
    @Override public Enumerable<@Nullable Object[]> bind(DataContext dataContext) {
      return new Interpreter(dataContext, getInput());
    }
  }
  