| /* |
| * 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.config.GlobalConfig; |
| 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.AFloatSerializerDeserializer; |
| import edu.uci.ics.asterix.dataflow.data.nontagged.serde.AInt16SerializerDeserializer; |
| import edu.uci.ics.asterix.dataflow.data.nontagged.serde.AInt32SerializerDeserializer; |
| import edu.uci.ics.asterix.dataflow.data.nontagged.serde.AInt64SerializerDeserializer; |
| import edu.uci.ics.asterix.dataflow.data.nontagged.serde.AInt8SerializerDeserializer; |
| 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.common.exceptions.NotImplementedException; |
| 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 AvgAggregateDescriptor extends AbstractAggregateFunctionDynamicDescriptor { |
| |
| private static final long serialVersionUID = 1L; |
| public static final IFunctionDescriptorFactory FACTORY = new IFunctionDescriptorFactory() { |
| public IFunctionDescriptor createFunctionDescriptor() { |
| return new AvgAggregateDescriptor(); |
| } |
| }; |
| |
| @Override |
| public FunctionIdentifier getIdentifier() { |
| return AsterixBuiltinFunctions.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 }, true); |
| } 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 sum; |
| private int count; |
| private ATypeTag aggType; |
| 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<ADouble> doubleSerde = AqlSerializerDeserializerProvider.INSTANCE |
| .getSerializerDeserializer(BuiltinType.ADOUBLE); |
| @SuppressWarnings("unchecked") |
| private ISerializerDeserializer<AInt32> intSerde = AqlSerializerDeserializerProvider.INSTANCE |
| .getSerializerDeserializer(BuiltinType.AINT32); |
| @SuppressWarnings("unchecked") |
| private ISerializerDeserializer<ANull> nullSerde = AqlSerializerDeserializerProvider.INSTANCE |
| .getSerializerDeserializer(BuiltinType.ANULL); |
| |
| @Override |
| public void init() throws AlgebricksException { |
| aggType = ATypeTag.SYSTEM_NULL; |
| sum = 0.0; |
| count = 0; |
| } |
| |
| @Override |
| public void step(IFrameTupleReference tuple) throws AlgebricksException { |
| inputVal.reset(); |
| eval.evaluate(tuple); |
| ATypeTag typeTag = EnumDeserializer.ATYPETAGDESERIALIZER |
| .deserialize(inputVal.getByteArray()[0]); |
| if (typeTag == ATypeTag.NULL || aggType == ATypeTag.NULL) { |
| aggType = ATypeTag.NULL; |
| return; |
| } else if (aggType == ATypeTag.SYSTEM_NULL) { |
| aggType = typeTag; |
| } else if (typeTag != ATypeTag.SYSTEM_NULL && typeTag != aggType) { |
| throw new AlgebricksException("Unexpected type " + typeTag |
| + " in aggregation input stream. Expected type " + aggType + "."); |
| } |
| if (typeTag != ATypeTag.SYSTEM_NULL) { |
| ++count; |
| } |
| switch (typeTag) { |
| case INT8: { |
| byte val = AInt8SerializerDeserializer.getByte(inputVal.getByteArray(), 1); |
| sum += val; |
| break; |
| } |
| case INT16: { |
| short val = AInt16SerializerDeserializer.getShort(inputVal.getByteArray(), 1); |
| sum += val; |
| break; |
| } |
| case INT32: { |
| int val = AInt32SerializerDeserializer.getInt(inputVal.getByteArray(), 1); |
| sum += val; |
| break; |
| } |
| case INT64: { |
| long val = AInt64SerializerDeserializer.getLong(inputVal.getByteArray(), 1); |
| sum += val; |
| break; |
| } |
| case FLOAT: { |
| float val = AFloatSerializerDeserializer.getFloat(inputVal.getByteArray(), 1); |
| sum += val; |
| break; |
| } |
| case DOUBLE: { |
| double val = ADoubleSerializerDeserializer.getDouble(inputVal.getByteArray(), 1); |
| sum += val; |
| break; |
| } |
| case NULL: { |
| break; |
| } |
| default: { |
| throw new NotImplementedException("Cannot compute AVG for values of type " + typeTag); |
| } |
| } |
| } |
| |
| @Override |
| public void finish() throws AlgebricksException { |
| try { |
| if (count == 0 || aggType == ATypeTag.NULL) { |
| nullSerde.serialize(ANull.NULL, out); |
| } else { |
| aDouble.setValue(sum / count); |
| doubleSerde.serialize(aDouble, out); |
| } |
| } catch (IOException e) { |
| throw new AlgebricksException(e); |
| } |
| } |
| |
| @Override |
| public void finishPartial() throws AlgebricksException { |
| if (count == 0) { |
| if (GlobalConfig.DEBUG) { |
| GlobalConfig.ASTERIX_LOGGER.finest("AVG aggregate ran over empty input."); |
| } |
| } else { |
| try { |
| if (aggType == ATypeTag.NULL) { |
| sumBytes.reset(); |
| nullSerde.serialize(ANull.NULL, sumBytesOutput); |
| } else { |
| sumBytes.reset(); |
| aDouble.setValue(sum); |
| doubleSerde.serialize(aDouble, sumBytesOutput); |
| } |
| countBytes.reset(); |
| aInt32.setValue(count); |
| intSerde.serialize(aInt32, countBytesOutput); |
| recordEval.evaluate(null); |
| } catch (IOException e) { |
| throw new AlgebricksException(e); |
| } |
| } |
| } |
| }; |
| } |
| }; |
| } |
| |
| } |
