org.apache.hudi.org.apache.hadoop_hive.metastore.hbase.stats.IExtrapolatePartStatus Maven / Gradle / Ivy
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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
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* 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,
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* See the License for the specific language governing permissions and
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*/
package org.apache.hadoop.hive.metastore.hbase.stats;
import java.util.Map;
import org.apache.hadoop.hive.metastore.api.ColumnStatisticsData;
public interface IExtrapolatePartStatus {
// The following function will extrapolate the stats when the column stats of
// some partitions are missing.
/**
* @param extrapolateData
* it will carry back the specific stats, e.g., DOUBLE_STATS or
* LONG_STATS
* @param numParts
* the total number of partitions
* @param numPartsWithStats
* the number of partitions that have stats
* @param adjustedIndexMap
* the partition name to index map
* @param adjustedStatsMap
* the partition name to its stats map
* @param densityAvg
* the average of ndv density, which is useful when
* useDensityFunctionForNDVEstimation is true.
*/
public abstract void extrapolate(ColumnStatisticsData extrapolateData, int numParts,
int numPartsWithStats, Map adjustedIndexMap,
Map adjustedStatsMap, double densityAvg);
}