| /* |
| * 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. |
| */ |
| |
| package edu.uci.ics.asterix.runtime.aggregates.std; |
| |
| import java.io.DataOutput; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import edu.uci.ics.asterix.common.exceptions.AsterixException; |
| import edu.uci.ics.asterix.dataflow.data.nontagged.serde.ADoubleSerializerDeserializer; |
| import edu.uci.ics.asterix.dataflow.data.nontagged.serde.AInt32SerializerDeserializer; |
| import edu.uci.ics.asterix.dataflow.data.nontagged.serde.ARecordSerializerDeserializer; |
| import edu.uci.ics.asterix.formats.nontagged.AqlSerializerDeserializerProvider; |
| import edu.uci.ics.asterix.om.base.ADouble; |
| import edu.uci.ics.asterix.om.base.AInt32; |
| import edu.uci.ics.asterix.om.base.AMutableDouble; |
| import edu.uci.ics.asterix.om.base.AMutableInt32; |
| import edu.uci.ics.asterix.om.base.ANull; |
| import edu.uci.ics.asterix.om.functions.AsterixBuiltinFunctions; |
| import edu.uci.ics.asterix.om.functions.IFunctionDescriptor; |
| import edu.uci.ics.asterix.om.functions.IFunctionDescriptorFactory; |
| import edu.uci.ics.asterix.om.types.ARecordType; |
| import edu.uci.ics.asterix.om.types.ATypeTag; |
| import edu.uci.ics.asterix.om.types.AUnionType; |
| import edu.uci.ics.asterix.om.types.BuiltinType; |
| import edu.uci.ics.asterix.om.types.EnumDeserializer; |
| import edu.uci.ics.asterix.om.types.IAType; |
| import edu.uci.ics.asterix.runtime.aggregates.base.AbstractAggregateFunctionDynamicDescriptor; |
| import edu.uci.ics.asterix.runtime.evaluators.common.AccessibleByteArrayEval; |
| import edu.uci.ics.asterix.runtime.evaluators.common.ClosedRecordConstructorEvalFactory.ClosedRecordConstructorEval; |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier; |
| import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyAggregateFunction; |
| import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyAggregateFunctionFactory; |
| import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator; |
| import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory; |
| import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer; |
| import edu.uci.ics.hyracks.data.std.api.IDataOutputProvider; |
| import edu.uci.ics.hyracks.data.std.util.ArrayBackedValueStorage; |
| import edu.uci.ics.hyracks.data.std.util.ByteArrayAccessibleOutputStream; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference; |
| |
| public class GlobalAvgAggregateDescriptor extends AbstractAggregateFunctionDynamicDescriptor { |
| |
| private static final long serialVersionUID = 1L; |
| |
| public static final IFunctionDescriptorFactory FACTORY = new IFunctionDescriptorFactory() { |
| public IFunctionDescriptor createFunctionDescriptor() { |
| return new GlobalAvgAggregateDescriptor(); |
| } |
| }; |
| |
| @Override |
| public FunctionIdentifier getIdentifier() { |
| return AsterixBuiltinFunctions.GLOBAL_AVG; |
| } |
| |
| @Override |
| public ICopyAggregateFunctionFactory createAggregateFunctionFactory(final ICopyEvaluatorFactory[] args) |
| throws AlgebricksException { |
| List<IAType> unionList = new ArrayList<IAType>(); |
| unionList.add(BuiltinType.ANULL); |
| unionList.add(BuiltinType.ADOUBLE); |
| ARecordType tmpRecType; |
| try { |
| tmpRecType = new ARecordType(null, new String[] { "sum", "count" }, new IAType[] { |
| new AUnionType(unionList, "OptionalDouble"), BuiltinType.AINT32 }, false); |
| } catch (AsterixException e) { |
| throw new AlgebricksException(e); |
| } |
| |
| final ARecordType recType = tmpRecType; |
| |
| return new ICopyAggregateFunctionFactory() { |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| public ICopyAggregateFunction createAggregateFunction(final IDataOutputProvider provider) |
| throws AlgebricksException { |
| |
| return new ICopyAggregateFunction() { |
| |
| private DataOutput out = provider.getDataOutput(); |
| private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage(); |
| private ICopyEvaluator eval = args[0].createEvaluator(inputVal); |
| private double globalSum; |
| private int globalCount; |
| private AMutableDouble aDouble = new AMutableDouble(0); |
| private AMutableInt32 aInt32 = new AMutableInt32(0); |
| |
| private ArrayBackedValueStorage avgBytes = new ArrayBackedValueStorage(); |
| private ByteArrayAccessibleOutputStream sumBytes = new ByteArrayAccessibleOutputStream(); |
| private DataOutput sumBytesOutput = new DataOutputStream(sumBytes); |
| private ByteArrayAccessibleOutputStream countBytes = new ByteArrayAccessibleOutputStream(); |
| private DataOutput countBytesOutput = new DataOutputStream(countBytes); |
| private ICopyEvaluator evalSum = new AccessibleByteArrayEval(avgBytes.getDataOutput(), sumBytes); |
| private ICopyEvaluator evalCount = new AccessibleByteArrayEval(avgBytes.getDataOutput(), countBytes); |
| private ClosedRecordConstructorEval recordEval = new ClosedRecordConstructorEval(recType, |
| new ICopyEvaluator[] { evalSum, evalCount }, avgBytes, out); |
| |
| @SuppressWarnings("unchecked") |
| private ISerializerDeserializer<AInt32> intSerde = AqlSerializerDeserializerProvider.INSTANCE |
| .getSerializerDeserializer(BuiltinType.AINT32); |
| @SuppressWarnings("unchecked") |
| private ISerializerDeserializer<ADouble> doubleSerde = AqlSerializerDeserializerProvider.INSTANCE |
| .getSerializerDeserializer(BuiltinType.ADOUBLE); |
| @SuppressWarnings("unchecked") |
| private ISerializerDeserializer<ANull> nullSerde = AqlSerializerDeserializerProvider.INSTANCE |
| .getSerializerDeserializer(BuiltinType.ANULL); |
| private boolean metNull; |
| |
| @Override |
| public void init() { |
| globalSum = 0.0; |
| globalCount = 0; |
| metNull = false; |
| } |
| |
| @Override |
| public void step(IFrameTupleReference tuple) throws AlgebricksException { |
| inputVal.reset(); |
| eval.evaluate(tuple); |
| byte[] serBytes = inputVal.getByteArray(); |
| ATypeTag typeTag = EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(serBytes[0]); |
| switch (typeTag) { |
| case NULL: { |
| metNull = true; |
| break; |
| } |
| case SYSTEM_NULL: { |
| // Ignore and return. |
| return; |
| } |
| case RECORD: { |
| // Expected. |
| break; |
| } |
| default: { |
| throw new AlgebricksException("Global-Avg is not defined for values of type " |
| + EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(serBytes[0])); |
| } |
| } |
| |
| // The record length helps us determine whether the input record fields are nullable. |
| int recordLength = ARecordSerializerDeserializer.getRecordLength(serBytes, 1); |
| int nullBitmapSize = 1; |
| if (recordLength == 29) { |
| nullBitmapSize = 0; |
| } |
| int offset1 = ARecordSerializerDeserializer.getFieldOffsetById(serBytes, 0, nullBitmapSize, |
| false); |
| if (offset1 == 0) // the sum is null |
| metNull = true; |
| else |
| globalSum += ADoubleSerializerDeserializer.getDouble(serBytes, offset1); |
| int offset2 = ARecordSerializerDeserializer.getFieldOffsetById(serBytes, 1, nullBitmapSize, |
| false); |
| if (offset2 != 0) // the count is not null |
| globalCount += AInt32SerializerDeserializer.getInt(serBytes, offset2); |
| |
| } |
| |
| @Override |
| public void finish() throws AlgebricksException { |
| try { |
| if (globalCount == 0 || metNull) |
| nullSerde.serialize(ANull.NULL, out); |
| else { |
| aDouble.setValue(globalSum / globalCount); |
| doubleSerde.serialize(aDouble, out); |
| } |
| } catch (IOException e) { |
| throw new AlgebricksException(e); |
| } |
| } |
| |
| @Override |
| public void finishPartial() throws AlgebricksException { |
| try { |
| if (metNull || globalCount == 0) { |
| sumBytes.reset(); |
| nullSerde.serialize(ANull.NULL, sumBytesOutput); |
| } else { |
| sumBytes.reset(); |
| aDouble.setValue(globalSum); |
| doubleSerde.serialize(aDouble, sumBytesOutput); |
| } |
| countBytes.reset(); |
| aInt32.setValue(globalCount); |
| intSerde.serialize(aInt32, countBytesOutput); |
| recordEval.evaluate(null); |
| } catch (IOException e) { |
| throw new AlgebricksException(e); |
| } |
| } |
| }; |
| } |
| }; |
| } |
| |
| } |