core/src/main/java/org/apache/calcite/interpreter/InterpretableConverter.java

/*
 * 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 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));
  }

  public Class<Object[]> getElementType() {
    return Object[].class;
  }

  public Enumerable<Object[]> bind(DataContext dataContext) {
    return new Interpreter(dataContext, getInput());
  }
}

// End InterpretableConverter.java