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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.drill.exec.physical.impl.statistics;
/*
* Base Statistics class - all statistics classes should extend this class
*/
public abstract class Statistic {
/*
* The lifecycle states for statistics
*/
public enum State {INIT, CONFIG, MERGE, COMPLETE};
/*
* List of statistics used in Drill.
*/
public static final String COLNAME = "column";
public static final String COLTYPE = "majortype";
public static final String SCHEMA = "schema";
public static final String COMPUTED = "computed";
public static final String ROWCOUNT = "rowcount";
public static final String NNROWCOUNT = "nonnullrowcount";
public static final String NDV = "approx_count_distinct";
public static final String HLL_MERGE = "hll_merge";
public static final String HLL = "hll";
public static final String AVG_WIDTH = "avg_width";
public static final String SUM_WIDTH = "sum_width";
public static final String CNT_DUPS = "approx_count_dups";
public static final String SUM_DUPS = "sum";
}
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