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.schemas.transforms;
  
  import java.util.Arrays;
  import java.util.List;
  import java.util.stream.Collectors;
  import org.apache.beam.sdk.schemas.Schema;
  import org.apache.beam.sdk.values.Row;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Lists;
  
  @SuppressWarnings({
    "rawtypes" // TODO(https://github.com/apache/beam/issues/20447)
  })
  class JoinTestUtils {
    static List<Row> innerJoin(
        List<Row> inputs1, List<Row> inputs2, String[] keys1, String[] keys2, Schema expectedSchema) {
      List<Row> joined = Lists.newArrayList();
      for (Row row1 : inputs1) {
        for (Row row2 : inputs2) {
          List key1 = Arrays.stream(keys1).map(row1::getValue).collect(Collectors.toList());
          List key2 = Arrays.stream(keys2).map(row2::getValue).collect(Collectors.toList());
          if (key1.equals(key2)) {
            joined.add(Row.withSchema(expectedSchema).addValues(row1, row2).build());
          }
        }
      }
      return joined;
    }
  
    static List<Row> innerJoin(
        List<Row> inputs1,
        List<Row> inputs2,
        List<Row> inputs3,
        String[] keys1,
        String[] keys2,
        String[] keys3,
        Schema expectedSchema) {
      List<Row> joined = Lists.newArrayList();
      for (Row row1 : inputs1) {
        for (Row row2 : inputs2) {
          for (Row row3 : inputs3) {
            List key1 = Arrays.stream(keys1).map(row1::getValue).collect(Collectors.toList());
            List key2 = Arrays.stream(keys2).map(row2::getValue).collect(Collectors.toList());
            List key3 = Arrays.stream(keys3).map(row3::getValue).collect(Collectors.toList());
            if (key1.equals(key2) && key2.equals(key3)) {
              joined.add(Row.withSchema(expectedSchema).addValues(row1, row2, row3).build());
            }
          }
        }
      }
      return joined;
    }
  }
  