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.
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  package org.apache.beam.sdk.extensions.sql.meta.provider.parquet;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import java.io.File;
  import java.util.Arrays;
  import java.util.List;
  import org.apache.beam.sdk.PipelineResult;
  import org.apache.beam.sdk.PipelineResult.State;
  import org.apache.beam.sdk.extensions.sql.impl.BeamSqlEnv;
  import org.apache.beam.sdk.extensions.sql.impl.rel.BeamSqlRelUtils;
  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.transforms.Count;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.Row;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.TemporaryFolder;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Test for ParquetTable. */
  @RunWith(JUnit4.class)
  public class ParquetTableProviderTest {
    @Rule public TestPipeline writePipeline = TestPipeline.create();
    @Rule public TestPipeline readPipeline = TestPipeline.create();
    @Rule public TemporaryFolder tempFolder = new TemporaryFolder();
  
    private static final String FIELD_NAMES = "(name VARCHAR, age BIGINT, country VARCHAR)";
    private static final Schema TABLE_SCHEMA =
        Schema.builder()
            .addStringField("name")
            .addInt64Field("age")
            .addStringField("country")
            .build();
  
    private static final Row ROW_1 =
        Row.withSchema(TABLE_SCHEMA).addValues("Alan", 22L, "England").build();
    private static final Row ROW_2 =
        Row.withSchema(TABLE_SCHEMA).addValues("John", 42L, "USA").build();
    private static final List<Row> ALL_ROWS = Arrays.asList(ROW_1, ROW_2);
  
    private BeamSqlEnv env;
  
    @Before
    public void setUp() {
      env = BeamSqlEnv.inMemory(new ParquetTableProvider());
    }
  
    @Test
    public void testReadAndFilter() {
      File destinationDir = new File(tempFolder.getRoot(), "person-info");
      String locationPath = destinationDir.getAbsolutePath() + File.separator;
  
      env.executeDdl(
          String.format(
              "CREATE EXTERNAL TABLE PersonInfo %s TYPE parquet LOCATION '%s'",
              FIELD_NAMES, locationPath));
  
      BeamSqlRelUtils.toPCollection(
          writePipeline,
          env.parseQuery(
              "INSERT INTO PersonInfo VALUES ('Alan', 22, 'England'), ('John', 42, 'USA')"));
      writePipeline.run().waitUntilFinish();
  
      Schema projectedSchema = Schema.builder().addStringField("name").addInt64Field("age").build();
      PCollection<Row> filteredAndProjected =
          BeamSqlRelUtils.toPCollection(
              readPipeline, env.parseQuery("SELECT name, age FROM PersonInfo WHERE age > 25"));
  
      PAssert.that(filteredAndProjected)
          .containsInAnyOrder(Row.withSchema(projectedSchema).addValues("John", 42L).build());
  
      readPipeline.run().waitUntilFinish();
    }
  
    @Test
    public void testLocationPathConventions() {
      File destinationDir = new File(tempFolder.getRoot(), "path-test-data");
      String writeLocation = destinationDir.getAbsolutePath() + File.separator;
      env.executeDdl(
          String.format(
              "CREATE EXTERNAL TABLE TmpWriteTable %s TYPE parquet LOCATION '%s'",
              FIELD_NAMES, writeLocation));
      BeamSqlRelUtils.toPCollection(
          writePipeline,
          env.parseQuery(
              "INSERT INTO TmpWriteTable VALUES ('Alan', 22, 'England'), ('John', 42, 'USA')"));
      writePipeline.run().waitUntilFinish();
  
      env.executeDdl(
          String.format(
              "CREATE EXTERNAL TABLE DirTable %s TYPE parquet LOCATION '%s'",
              FIELD_NAMES, writeLocation));
      PCollection<Row> dirResult =
          BeamSqlRelUtils.toPCollection(readPipeline, env.parseQuery("SELECT * FROM DirTable"));
      PAssert.that("Directory with '/' reads all files", dirResult).containsInAnyOrder(ALL_ROWS);
  
      String globPath = new File(destinationDir, "output-*").getAbsolutePath();
      env.executeDdl(
          String.format(
              "CREATE EXTERNAL TABLE GlobTable %s TYPE parquet LOCATION '%s'",
              FIELD_NAMES, globPath));
      PCollection<Row> globResult =
          BeamSqlRelUtils.toPCollection(readPipeline, env.parseQuery("SELECT * FROM GlobTable"));
      PAssert.that("Glob 'output-*' reads all files", globResult).containsInAnyOrder(ALL_ROWS);
  
      File[] writtenFiles = destinationDir.listFiles((dir, name) -> name.startsWith("output-"));
      assertTrue(
          "Test setup failed: No output files found",
          writtenFiles != null && writtenFiles.length > 0);
      String singleFilePath = writtenFiles[0].getAbsolutePath();
  
      env.executeDdl(
          String.format(
              "CREATE EXTERNAL TABLE SingleFileTable %s TYPE parquet LOCATION '%s'",
              FIELD_NAMES, singleFilePath));
      PCollection<Row> singleFileResult =
          BeamSqlRelUtils.toPCollection(
              readPipeline, env.parseQuery("SELECT * FROM SingleFileTable"));
  
      PCollection<Long> count = singleFileResult.apply(Count.globally());
      PAssert.thatSingleton(count)
          .satisfies(
              actualCount -> {
                assertTrue("Count should be greater than 0", actualCount > 0L);
                return null;
              });
  
      PipelineResult.State state = readPipeline.run().waitUntilFinish();
      assertEquals(State.DONE, state);
    }
  }
  