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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,
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   * See the License for the specific language governing permissions and
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  package org.apache.beam.sdk.extensions.sql.meta.provider.test;
  
  import static org.apache.beam.sdk.extensions.sql.meta.provider.test.TestTableProvider.PUSH_DOWN_OPTION;
  
  import org.apache.beam.sdk.extensions.sql.TableUtils;
  import org.apache.beam.sdk.extensions.sql.meta.BeamSqlTable;
  import org.apache.beam.sdk.extensions.sql.meta.Table;
  import org.apache.beam.sdk.extensions.sql.meta.provider.test.TestTableProvider.PushDownOptions;
  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.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  import org.joda.time.Duration;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  @RunWith(JUnit4.class)
  public class TestTableProviderTest {
    private static final Schema BASIC_SCHEMA =
        Schema.builder().addInt32Field("id").addStringField("name").build();
    private BeamSqlTable beamSqlTable;
  
    @Rule public TestPipeline pipeline = TestPipeline.create();
  
    @Before
    public void buildUp() {
      TestTableProvider tableProvider = new TestTableProvider();
      Table table = getTable("tableName");
      tableProvider.createTable(table);
      tableProvider.addRows(
          table.getName(), row(BASIC_SCHEMA, 1, "one"), row(BASIC_SCHEMA, 2, "two"));
  
      beamSqlTable = tableProvider.buildBeamSqlTable(table);
    }
  
    @Test
    public void testInMemoryTableProvider_returnsSelectedColumns() {
      PCollection<Row> result =
          beamSqlTable.buildIOReader(
              pipeline.begin(),
              beamSqlTable.constructFilter(ImmutableList.of()),
              ImmutableList.of("name"));
  
      PAssert.that(result)
          .containsInAnyOrder(row(result.getSchema(), "one"), row(result.getSchema(), "two"));
  
      pipeline.run().waitUntilFinish(Duration.standardMinutes(2));
    }
  
    @Test
    public void testInMemoryTableProvider_withEmptySelectedColumns_returnsAllColumns() {
      PCollection<Row> result =
          beamSqlTable.buildIOReader(
              pipeline.begin(), beamSqlTable.constructFilter(ImmutableList.of()), ImmutableList.of());
  
      PAssert.that(result)
          .containsInAnyOrder(row(result.getSchema(), 1, "one"), row(result.getSchema(), 2, "two"));
  
      pipeline.run().waitUntilFinish(Duration.standardMinutes(2));
    }
  
    @Test
    public void testInMemoryTableProvider_withAllSelectedColumns_returnsAllColumns() {
      PCollection<Row> result =
          beamSqlTable.buildIOReader(
              pipeline.begin(),
              beamSqlTable.constructFilter(ImmutableList.of()),
              ImmutableList.of("name", "id"));
  
      // Selected columns are outputted in the same order they are listed in the schema.
      PAssert.that(result)
          .containsInAnyOrder(row(result.getSchema(), "one", 1), row(result.getSchema(), "two", 2));
  
      pipeline.run().waitUntilFinish(Duration.standardMinutes(2));
    }
  
    @Test
    public void testInMemoryTableProvider_withDuplicateSelectedColumns_returnsSelectedColumnsOnce() {
      PCollection<Row> result =
          beamSqlTable.buildIOReader(
              pipeline.begin(),
              beamSqlTable.constructFilter(ImmutableList.of()),
              ImmutableList.of("name", "name"));
  
      PAssert.that(result)
          .containsInAnyOrder(row(result.getSchema(), "one"), row(result.getSchema(), "two"));
  
      pipeline.run().waitUntilFinish(Duration.standardMinutes(2));
    }
  
    private static Row row(Schema schema, Object... objects) {
      return Row.withSchema(schema).addValues(objects).build();
    }
  
    private static Table getTable(String name) {
      return Table.builder()
          .name(name)
          .comment(name + " table")
          .schema(BASIC_SCHEMA)
          .properties(
              TableUtils.parseProperties(
                  "{ \""
                      + PUSH_DOWN_OPTION
                      + "\": "
                      + "\""
                      + PushDownOptions.BOTH.toString()
                      + "\" }"))
          .type("test")
          .build();
    }
  }
  