com.arcadedb.query.sql.function.math.SQLFunctionMode Maven / Gradle / Ivy

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/*
 * Copyright © 2021-present Arcade Data Ltd ([email protected])
 *
 * Licensed 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.
 *
 * SPDX-FileCopyrightText: 2021-present Arcade Data Ltd ([email protected])
 * SPDX-License-Identifier: Apache-2.0
 */
package com.arcadedb.query.sql.function.math;

import com.arcadedb.database.Identifiable;
import com.arcadedb.query.sql.executor.CommandContext;
import com.arcadedb.query.sql.executor.MultiValue;
import com.arcadedb.query.sql.function.SQLFunctionAbstract;

import java.util.*;

/**
 * Compute the mode (or multimodal) value for a field. The scores in the field's distribution that occurs more frequently. Nulls are
 * ignored in the calculation.
 *
 * @author Fabrizio Fortino
 */
public class SQLFunctionMode extends SQLFunctionAbstract {

  public static final String NAME = "mode";

  private final Map seen     = new HashMap();
  private       int                  max      = 0;
  private final List