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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.plan.RelOptCluster;
import org.apache.calcite.rel.core.Aggregate;
import org.apache.calcite.rel.core.Filter;
import org.apache.calcite.rel.core.Join;
import org.apache.calcite.rel.core.Project;
import org.apache.calcite.rel.core.Sort;
import org.apache.calcite.rel.core.TableScan;
import org.apache.calcite.rel.core.Union;
import org.apache.calcite.rel.core.Values;
import org.apache.calcite.rel.core.Window;
import org.apache.calcite.rex.RexNode;

import com.google.common.collect.ImmutableList;

/**
 * Helper methods for {@link Node} and implementations for core relational
 * expressions.
 */
public class Nodes {
  /** Extension to
   * {@link Interpreter.CompilerImpl}
   * that knows how to handle the core logical
   * {@link org.apache.calcite.rel.RelNode}s. */
  public static class CoreCompiler extends Interpreter.CompilerImpl {
    CoreCompiler(Interpreter interpreter, RelOptCluster cluster) {
      super(interpreter, cluster);
    }

    public void visit(Aggregate agg) {
      node = new AggregateNode(this, agg);
    }

    public void visit(Filter filter) {
      node = new FilterNode(this, filter);
    }

    public void visit(Project project) {
      node = new ProjectNode(this, project);
    }

    public void visit(Values value) {
      node = new ValuesNode(this, value);
    }

    public void visit(TableScan scan) {
      final ImmutableList filters = ImmutableList.of();
      node = TableScanNode.create(this, scan, filters, null);
    }

    public void visit(Bindables.BindableTableScan scan) {
      node = TableScanNode.create(this, scan, scan.filters, scan.projects);
    }

    public void visit(Sort sort) {
      node = new SortNode(this, sort);
    }

    public void visit(Union union) {
      node = new UnionNode(this, union);
    }

    public void visit(Join join) {
      node = new JoinNode(this, join);
    }

    public void visit(Window window) {
      node = new WindowNode(this, window);
    }
  }
}

// End Nodes.java