ql/src/java/org/apache/hadoop/hive/ql/parse/ColumnStatsList.java

/*
 * 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.hadoop.hive.ql.parse;

import java.util.HashMap;
import java.util.Map;

import org.apache.hadoop.hive.ql.plan.ColStatistics;
import org.apache.hadoop.hive.ql.plan.Statistics;
import org.apache.hadoop.hive.ql.plan.Statistics.State;

/**
 * The list of column stats and their state.
 */
public class ColumnStatsList {

  /** State. */
  private State state;

  /** Column stats. */
  private final Map<String, ColStatistics> colStats;

  public ColumnStatsList() {
    this.state = State.NONE;
    this.colStats = new HashMap<>();
  }

  public State getState() {
    return state;
  }

  public void updateState(State newState) {
    this.state = Statistics.inferColumnStatsState(this.state, newState);
  }

  public Map<String, ColStatistics> getColStats() {
    return colStats;
  }

  public void put(String columnName, ColStatistics cStats) {
    this.colStats.put(columnName, cStats);
  }

  @Override
  public String toString() {
    return "{ " + state + ", " + colStats + " }";
  }

}