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   * 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.
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  package org.apache.beam.sdk.extensions.sql.impl.rel;
  
  import org.apache.beam.sdk.extensions.sql.TestUtils;
  import org.apache.beam.sdk.extensions.sql.impl.planner.BeamRelMetadataQuery;
  import org.apache.beam.sdk.extensions.sql.impl.planner.NodeStats;
  import org.apache.beam.sdk.extensions.sql.meta.provider.test.TestBoundedTable;
  import org.apache.beam.sdk.schemas.Schema;
  import org.apache.beam.sdk.testing.PAssert;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.Row;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.RelNode;
  import org.junit.Assert;
  import org.junit.BeforeClass;
  import org.junit.Rule;
  import org.junit.Test;
  
  /** Test for {@code BeamValuesRel}. */
  public class BeamValuesRelTest extends BaseRelTest {
    @Rule public final TestPipeline pipeline = TestPipeline.create();
  
    @BeforeClass
    public static void prepare() {
      registerTable(
          "string_table",
          TestBoundedTable.of(
              Schema.FieldType.STRING, "name",
              Schema.FieldType.STRING, "description"));
      registerTable(
          "int_table",
          TestBoundedTable.of(
              Schema.FieldType.INT32, "c0",
              Schema.FieldType.INT32, "c1"));
    }
  
    @Test
    public void testValues() throws Exception {
      String sql =
          "insert into string_table(name, description) values "
              + "('hello', 'world'), ('james', 'bond')";
      PCollection<Row> rows = compilePipeline(sql, pipeline);
      PAssert.that(rows)
          .containsInAnyOrder(
              TestUtils.RowsBuilder.of(
                      Schema.FieldType.STRING, "name",
                      Schema.FieldType.STRING, "description")
                  .addRows(
                      "hello", "world",
                      "james", "bond")
                  .getRows());
      pipeline.run();
    }
  
    @Test
    public void testValues_castInt() throws Exception {
      String sql = "insert into int_table (c0, c1) values(cast(1 as int), cast(2 as int))";
      PCollection<Row> rows = compilePipeline(sql, pipeline);
      PAssert.that(rows)
          .containsInAnyOrder(
              TestUtils.RowsBuilder.of(
                      Schema.FieldType.INT32, "c0",
                      Schema.FieldType.INT32, "c1")
                  .addRows(1, 2)
                  .getRows());
      pipeline.run();
    }
  
    @Test
    public void testValues_onlySelect() throws Exception {
      String sql = "select 1, '1'";
      PCollection<Row> rows = compilePipeline(sql, pipeline);
      PAssert.that(rows)
          .containsInAnyOrder(
              TestUtils.RowsBuilder.of(
                      Schema.FieldType.INT32, "EXPR$0",
                      Schema.FieldType.STRING, "EXPR$1")
                  .addRows(1, "1")
                  .getRows());
      pipeline.run();
    }
  
    @Test
    public void testValues_selectEmpty() throws Exception {
      String sql = "select 1, '1' FROM string_table WHERE false";
      PCollection<Row> rows = compilePipeline(sql, pipeline);
      PAssert.that(rows)
          .containsInAnyOrder(
              TestUtils.RowsBuilder.of(
                      Schema.FieldType.INT32, "EXPR$0",
                      Schema.FieldType.STRING, "EXPR$1")
                  .getRows());
      pipeline.run();
    }
  
    @Test
    public void testNodeStatsEstimation() {
      String sql =
          "SELECT * FROM (VALUES ('value1'),('value2'),('value3'),('value4'),('value5'),"
              + " ('value6'),('value7'),('value8'),('value9'))";
  
      RelNode root = env.parseQuery(sql);
  
      while (!(root instanceof BeamValuesRel)) {
        root = root.getInput(0);
      }
  
      NodeStats estimate =
          BeamSqlRelUtils.getNodeStats(
              root, ((BeamRelMetadataQuery) root.getCluster().getMetadataQuery()));
  
      Assert.assertFalse(estimate.isUnknown());
      Assert.assertEquals(0d, estimate.getRate(), 0.01);
  
      Assert.assertEquals(9., estimate.getRowCount(), 0.01);
      Assert.assertEquals(9., estimate.getWindow(), 0.01);
    }
  }
  