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.plan.volcano;
  
  import org.apache.calcite.plan.RelOptUtil;
  import org.apache.calcite.rel.RelNode;
  import org.apache.calcite.schema.SchemaPlus;
  import org.apache.calcite.sql.parser.SqlParser;
  import org.apache.calcite.test.CalciteAssert;
  import org.apache.calcite.tools.FrameworkConfig;
  import org.apache.calcite.tools.Frameworks;
  import org.apache.calcite.tools.RelBuilder;
  import org.apache.calcite.util.Util;
  
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  /**
   * Unit test for {@link RelSet}.
   */
  public class RelSetTest {
  
    /**
     * Tests for adding RelNode with same RelDataType.
     */
    @Test void testAddRelNodeWithSameRowType() {
      RelBuilder builder = createRelBuilder();
      RelNode relNodeA =
          builder.scan("myTable").project(builder.field("a")).build();
      RelNode relNodeE =
          builder.scan("myTable").project(builder.field("e")).build();
      RelSet relSet =
          new RelSet(1,
              Util.minus(RelOptUtil.getVariablesSet(relNodeA),
                  relNodeA.getVariablesSet()),
              RelOptUtil.getVariablesUsed(relNodeA));
      relSet.add(relNodeA);
      relSet.add(relNodeE);
    }
  
    /**
     * Tests for adding RelNode with different RelDataType.
     */
    @Test void testAddRelNodeWithDifferentRowType() {
      RelBuilder builder = createRelBuilder();
      RelNode relNodeA =
          builder.scan("myTable").project(builder.field("a")).build();
      RelNode relNodeN =
          builder.scan("myTable").project(builder.field("n1")).build();
      RelSet relSet =
          new RelSet(1,
              Util.minus(RelOptUtil.getVariablesSet(relNodeA),
                  relNodeA.getVariablesSet()),
              RelOptUtil.getVariablesUsed(relNodeA));
      relSet.add(relNodeA);
      assertThrows(AssertionError.class, () -> relSet.add(relNodeN));
    }
  
    private RelBuilder createRelBuilder() {
      SchemaPlus rootSchema = Frameworks.createRootSchema(true);
      SchemaPlus defaultSchema = CalciteAssert.addSchema(rootSchema, CalciteAssert.SchemaSpec.MY_DB);
      FrameworkConfig config = Frameworks.newConfigBuilder()
          .parserConfig(SqlParser.Config.DEFAULT)
          .defaultSchema(defaultSchema)
          .build();
      return RelBuilder.create(config);
    }
  }
  