content: /*
   * 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.asterix.runtime.aggregates.std;
  
  import org.apache.asterix.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
  import org.apache.hyracks.api.context.IEvaluatorContext;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.api.exceptions.SourceLocation;
  import org.apache.hyracks.data.std.api.IPointable;
  import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
  
  public class LocalSkewnessAggregateFunction extends AbstractSingleVarStatisticsAggregateFunction {
  
      public LocalSkewnessAggregateFunction(IScalarEvaluatorFactory[] args, IEvaluatorContext context,
              SourceLocation sourceLoc) throws HyracksDataException {
          super(args, context, sourceLoc);
      }
  
      @Override
      public void step(IFrameTupleReference tuple) throws HyracksDataException {
          processDataValues(tuple);
      }
  
      @Override
      public void finish(IPointable result) throws HyracksDataException {
          finishPartialResults(result);
      }
  
      @Override
      public void finishPartial(IPointable result) throws HyracksDataException {
          finish(result);
      }
  
      @Override
      protected void processNull() {
          aggType = ATypeTag.NULL;
      }
  
      @Override
      protected boolean skipStep() {
          return aggType == ATypeTag.NULL;
      }
  
      @Override
      protected boolean getM3Flag() {
          return true;
      }
  
      @Override
      protected boolean getM4Flag() {
          return false;
      }
  
      @Override
      protected FunctionIdentifier getFunctionIdentifier() {
          return BuiltinFunctions.SKEWNESS;
      }
  
  }
  