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.beam.sdk.extensions.sql;
  
  import java.time.LocalDate;
  import org.apache.beam.sdk.extensions.sql.impl.utils.CalciteUtils;
  import org.apache.beam.sdk.schemas.Schema;
  import org.apache.beam.sdk.schemas.logicaltypes.SqlTypes;
  import org.apache.beam.sdk.testing.PAssert;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.Row;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  
  /** Ad-hoc tests for CAST. */
  public class BeamSqlCastTest {
  
    private static final Schema INPUT_ROW_SCHEMA =
        Schema.builder().addInt32Field("f_int").addStringField("f_string").build();
  
    @Rule public final TestPipeline pipeline = TestPipeline.create();
    @Rule public ExpectedException exceptions = ExpectedException.none();
  
    @Test
    public void testCastToDate() {
      PCollection<Row> input =
          pipeline.apply(
              Create.of(Row.withSchema(INPUT_ROW_SCHEMA).addValues(1).addValue("20181018").build())
                  .withRowSchema(INPUT_ROW_SCHEMA));
  
      Schema resultType =
          Schema.builder()
              .addInt32Field("f_int")
              .addNullableField("f_date", CalciteUtils.DATE)
              .build();
  
      PCollection<Row> result =
          input.apply(
              SqlTransform.query(
                  "SELECT f_int, \n"
                      + "   CAST( \n"
                      + "     SUBSTRING(TRIM(f_string) FROM 1 FOR 4) \n"
                      + "      ||'-' \n"
                      + "      ||SUBSTRING(TRIM(f_string) FROM 5 FOR 2) \n"
                      + "      ||'-' \n"
                      + "      ||SUBSTRING(TRIM(f_string) FROM 7 FOR 2) as DATE) \n"
                      + "FROM PCOLLECTION"));
  
      PAssert.that(result)
          .containsInAnyOrder(
              Row.withSchema(resultType).addValues(1, LocalDate.of(2018, 10, 18)).build());
  
      pipeline.run();
    }
  
    @Test
    public void testCastToDateWithCase() {
      PCollection<Row> input =
          pipeline.apply(
              Create.of(Row.withSchema(INPUT_ROW_SCHEMA).addValues(1).addValue("20181018").build())
                  .withRowSchema(INPUT_ROW_SCHEMA));
  
      Schema resultType =
          Schema.builder()
              .addInt32Field("f_int")
              .addLogicalTypeField("f_date", SqlTypes.DATE)
              .build();
  
      PCollection<Row> result =
          input.apply(
              "sqlQuery",
              SqlTransform.query(
                  "SELECT f_int, \n"
                      + "CASE WHEN CHAR_LENGTH(TRIM(f_string)) = 8 \n"
                      + "    THEN CAST (\n"
                      + "       SUBSTRING(TRIM(f_string) FROM 1 FOR 4) \n"
                      + "        ||'-' \n"
                      + "        ||SUBSTRING(TRIM(f_string) FROM 5 FOR 2) \n"
                      + "        ||'-' \n"
                      + "        ||SUBSTRING(TRIM(f_string) FROM 7 FOR 2) AS DATE)\n"
                      + "    ELSE DATE '2001-01-01'\n"
                      + "END \n"
                      + "FROM PCOLLECTION"));
  
      PAssert.that(result)
          .containsInAnyOrder(
              Row.withSchema(resultType).addValues(1, LocalDate.of(2018, 10, 18)).build());
  
      pipeline.run();
    }
  }
  