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  /*
   * Copyright 2009-2013 by The Regents of the University of California
   * 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 from
   * 
   *     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.
  */
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.udf.generic;
 
 
 import  org.apache.hadoop.hive.ql.exec.Description;
 import  org.apache.hadoop.hive.ql.exec.UDFArgumentTypeException;
 import  org.apache.hadoop.hive.ql.metadata.HiveException;
 import  org.apache.hadoop.hive.ql.parse.SemanticException;
 import  org.apache.hadoop.hive.serde2.io.DoubleWritable;
 import  org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
 import  org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
 import  org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
 import  org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils;
 import  org.apache.hadoop.hive.serde2.typeinfo.PrimitiveTypeInfo;
 import  org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
 import  org.apache.hadoop.io.LongWritable;
 import  org.apache.hadoop.util.StringUtils;
 
GenericUDAFSum.
 
 @Description(name = "sum", value = "_FUNC_(x) - Returns the sum of a set of numbers")
 public class GenericUDAFSum extends AbstractGenericUDAFResolver {
 
     static final Log LOG = LogFactory.getLog(GenericUDAFSum.class.getName());
 
     @Override
     public GenericUDAFEvaluator getEvaluator(TypeInfo[] parametersthrows SemanticException {
         if (parameters.length != 1) {
             throw new UDFArgumentTypeException(parameters.length - 1, "Exactly one argument is expected.");
         }
 
         if (parameters[0].getCategory() != ObjectInspector.Category.PRIMITIVE) {
             throw new UDFArgumentTypeException(0, "Only primitive type arguments are accepted but "
                     + parameters[0].getTypeName() + " is passed.");
         }
         switch (((PrimitiveTypeInfo) parameters[0]).getPrimitiveCategory()) {
             case BYTE:
             case SHORT:
             case INT:
             case LONG:
                 return new GenericUDAFSumLong();
             case FLOAT:
             case DOUBLE:
             case STRING:
                 return new GenericUDAFSumDouble();
             case BOOLEAN:
             default:
                 throw new UDFArgumentTypeException(0, "Only numeric or string type arguments are accepted but "
                         + parameters[0].getTypeName() + " is passed.");
         }
     }

    
GenericUDAFSumDouble.
 
     public static class GenericUDAFSumDouble extends GenericUDAFEvaluator {
         private PrimitiveObjectInspector inputOI;
         private DoubleWritable result;
 
         @Override
         public ObjectInspector init(Mode m, ObjectInspector[] parametersthrows HiveException {
            assert (parameters.length == 1);
            super.init(mparameters);
             = new DoubleWritable(0);
             = (PrimitiveObjectInspector) parameters[0];
            return PrimitiveObjectInspectorFactory.writableDoubleObjectInspector;
        }

        
class for storing double sum value.
        static class SumDoubleAgg implements SerializableBuffer {
            boolean empty;
            double sum;
            @Override
            public void deSerializeAggBuffer(byte[] dataint startint len) {
                 = BufferSerDeUtil.getBoolean(datastart);
                start += 1;
                 = BufferSerDeUtil.getDouble(datastart);
            }
            @Override
            public void serializeAggBuffer(byte[] dataint startint len) {
                BufferSerDeUtil.writeBoolean(datastart);
                start += 1;
                BufferSerDeUtil.writeDouble(datastart);
            }
            @Override
            public void serializeAggBuffer(DataOutput outputthrows IOException {
                output.writeBoolean();
                output.writeDouble();
            }
        }
        @Override
        public AggregationBuffer getNewAggregationBuffer() throws HiveException {
            SumDoubleAgg result = new SumDoubleAgg();
            reset(result);
            return result;
        }
        @Override
        public void reset(AggregationBuffer aggthrows HiveException {
            SumDoubleAgg myagg = (SumDoubleAggagg;
            myagg.empty = true;
            myagg.sum = 0;
        }
        boolean warned = false;
        @Override
        public void iterate(AggregationBuffer aggObject[] parametersthrows HiveException {
            assert (parameters.length == 1);
            try {
                merge(aggparameters[0]);
            } catch (NumberFormatException e) {
                if (!) {
                     = true;
                    .warn(getClass().getSimpleName() + " " + StringUtils.stringifyException(e));
                    .warn(getClass().getSimpleName() + " ignoring similar exceptions.");
                }
            }
        }
        @Override
        public Object terminatePartial(AggregationBuffer aggthrows HiveException {
            return terminate(agg);
        }
        @Override
        public void merge(AggregationBuffer aggObject partialthrows HiveException {
            if (partial != null) {
                SumDoubleAgg myagg = (SumDoubleAggagg;
                myagg.empty = false;
                myagg.sum += PrimitiveObjectInspectorUtils.getDouble(partial);
            }
        }
        @Override
        public Object terminate(AggregationBuffer aggthrows HiveException {
            SumDoubleAgg myagg = (SumDoubleAggagg;
            if (myagg.empty) {
                return null;
            }
            .set(myagg.sum);
            return ;
        }
    }

    
GenericUDAFSumLong.
    public static class GenericUDAFSumLong extends GenericUDAFEvaluator {
        private PrimitiveObjectInspector inputOI;
        private LongWritable result;
        @Override
        public ObjectInspector init(Mode m, ObjectInspector[] parametersthrows HiveException {
            assert (parameters.length == 1);
            super.init(mparameters);
             = new LongWritable(0);
             = (PrimitiveObjectInspector) parameters[0];
            return PrimitiveObjectInspectorFactory.writableLongObjectInspector;
        }

        
class for storing double sum value.
        static class SumLongAgg implements SerializableBuffer {
            boolean empty;
            long sum;
            @Override
            public void deSerializeAggBuffer(byte[] dataint startint len) {
                 = BufferSerDeUtil.getBoolean(datastart);
                start += 1;
                 = BufferSerDeUtil.getLong(datastart);
            }
            @Override
            public void serializeAggBuffer(byte[] dataint startint len) {
                BufferSerDeUtil.writeBoolean(datastart);
                start += 1;
                BufferSerDeUtil.writeLong(datastart);
            }
            @Override
            public void serializeAggBuffer(DataOutput outputthrows IOException {
                output.writeBoolean();
                output.writeLong();
            }
        }
        @Override
        public AggregationBuffer getNewAggregationBuffer() throws HiveException {
            SumLongAgg result = new SumLongAgg();
            reset(result);
            return result;
        }
        @Override
        public void reset(AggregationBuffer aggthrows HiveException {
            SumLongAgg myagg = (SumLongAggagg;
            myagg.empty = true;
            myagg.sum = 0;
        }
        private boolean warned = false;
        @Override
        public void iterate(AggregationBuffer aggObject[] parametersthrows HiveException {
            assert (parameters.length == 1);
            try {
                merge(aggparameters[0]);
            } catch (NumberFormatException e) {
                if (!) {
                     = true;
                    .warn(getClass().getSimpleName() + " " + StringUtils.stringifyException(e));
                }
            }
        }
        @Override
        public Object terminatePartial(AggregationBuffer aggthrows HiveException {
            return terminate(agg);
        }
        @Override
        public void merge(AggregationBuffer aggObject partialthrows HiveException {
            if (partial != null) {
                SumLongAgg myagg = (SumLongAggagg;
                myagg.sum += PrimitiveObjectInspectorUtils.getLong(partial);
                myagg.empty = false;
            }
        }
        @Override
        public Object terminate(AggregationBuffer aggthrows HiveException {
            SumLongAgg myagg = (SumLongAggagg;
            if (myagg.empty) {
                return null;
            }
            .set(myagg.sum);
            return ;
        }
    }
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