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Core Calcite APIs and engine.

There is a newer version: 1.17.0-flink-r3

/*
 * 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.jdbc.CalcitePrepare;
import org.apache.calcite.rel.RelNode;

import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * Relational expression that can implement itself using an interpreter.
 */
public interface InterpretableRel extends RelNode {
  /** Creates an interpreter node to implement this relational expression. */
  Node implement(InterpreterImplementor implementor);

  /** Context when a {@link RelNode} is being converted to an interpreter
   * {@link Node}. */
  class InterpreterImplementor {
    public final Compiler compiler;
    public final Map internalParameters =
        new LinkedHashMap<>();
    public final CalcitePrepare.SparkHandler spark;
    public final DataContext dataContext;
    public final Map> relSinks = new HashMap<>();

    public InterpreterImplementor(Compiler compiler,
        CalcitePrepare.SparkHandler spark,
        DataContext dataContext) {
      this.compiler = compiler;
      this.spark = spark;
      this.dataContext = dataContext;
    }
  }
}

// End InterpretableRel.java