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A table format for huge analytic datasets

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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.
 */
package org.apache.iceberg.flink.sink.shuffle;

import java.io.Serializable;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.iceberg.relocated.com.google.common.base.MoreObjects;
import org.apache.iceberg.relocated.com.google.common.base.Preconditions;

/**
 * AggregatedStatistics is used by {@link DataStatisticsCoordinator} to collect {@link
 * DataStatistics} from {@link DataStatisticsOperator} subtasks for specific checkpoint. It stores
 * the merged {@link DataStatistics} result from all reported subtasks.
 */
class AggregatedStatistics, S> implements Serializable {

  private final long checkpointId;
  private final DataStatistics dataStatistics;

  AggregatedStatistics(long checkpoint, TypeSerializer> statisticsSerializer) {
    this.checkpointId = checkpoint;
    this.dataStatistics = statisticsSerializer.createInstance();
  }

  AggregatedStatistics(long checkpoint, DataStatistics dataStatistics) {
    this.checkpointId = checkpoint;
    this.dataStatistics = dataStatistics;
  }

  long checkpointId() {
    return checkpointId;
  }

  DataStatistics dataStatistics() {
    return dataStatistics;
  }

  void mergeDataStatistic(String operatorName, long eventCheckpointId, D eventDataStatistics) {
    Preconditions.checkArgument(
        checkpointId == eventCheckpointId,
        "Received unexpected event from operator %s checkpoint %s. Expected checkpoint %s",
        operatorName,
        eventCheckpointId,
        checkpointId);
    dataStatistics.merge(eventDataStatistics);
  }

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(this)
        .add("checkpointId", checkpointId)
        .add("dataStatistics", dataStatistics)
        .toString();
  }
}