| /* |
| * Copyright 2016, Yahoo! Inc. |
| * Licensed under the terms of the Apache License 2.0. See LICENSE file at the project root for terms. |
| */ |
| |
| package com.yahoo.sketches.hive.tuple; |
| |
| import static com.yahoo.sketches.Util.DEFAULT_NOMINAL_ENTRIES; |
| |
| import java.util.Arrays; |
| |
| import org.apache.hadoop.hive.ql.exec.UDFArgumentException; |
| 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.ql.udf.generic.AbstractGenericUDAFResolver; |
| import org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator; |
| import org.apache.hadoop.hive.ql.udf.generic.GenericUDAFParameterInfo; |
| import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector; |
| import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorFactory; |
| import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector; |
| import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector.PrimitiveCategory; |
| import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector; |
| import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory; |
| import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils; |
| |
| import com.yahoo.sketches.tuple.UpdatableSummary; |
| |
| public abstract class DataToSketchUDAF extends AbstractGenericUDAFResolver { |
| |
| @Override |
| public GenericUDAFEvaluator getEvaluator(final GenericUDAFParameterInfo info) throws SemanticException { |
| final ObjectInspector[] inspectors = info.getParameterObjectInspectors(); |
| |
| if (inspectors.length < 2) { |
| throw new UDFArgumentException("Expected at least 2 arguments"); |
| } |
| ObjectInspectorValidator.validateCategoryPrimitive(inspectors[0], 0); |
| |
| // No validation of the value inspector since it can be anything. |
| // Override this method to validate if needed. |
| |
| // nominal number of entries |
| if (inspectors.length > 2) { |
| ObjectInspectorValidator.validateIntegralParameter(inspectors[2], 2); |
| } |
| |
| // sampling probability |
| if (inspectors.length > 3) { |
| ObjectInspectorValidator.validateCategoryPrimitive(inspectors[3], 3); |
| final PrimitiveObjectInspector primitiveInspector = (PrimitiveObjectInspector) inspectors[3]; |
| if (primitiveInspector.getPrimitiveCategory() != PrimitiveCategory.FLOAT |
| && primitiveInspector.getPrimitiveCategory() != PrimitiveCategory.DOUBLE) { |
| throw new UDFArgumentTypeException(3, "float or double value expected as parameter 4 but " |
| + primitiveInspector.getPrimitiveCategory().name() + " was received"); |
| } |
| } |
| |
| checkExtraArguments(inspectors); |
| |
| return createEvaluator(); |
| } |
| |
| /** |
| * Override this if your UDF has more arguments |
| * @param inspectors array of inspectors |
| * @throws SemanticException if anything is wrong |
| */ |
| protected void checkExtraArguments(final ObjectInspector[] inspectors) throws SemanticException { |
| if (inspectors.length > 4) { |
| throw new UDFArgumentException("Expected no more than 4 arguments"); |
| } |
| } |
| |
| /** |
| * This is needed because a concrete UDAF is going to have its own concrete evaluator static inner class. |
| * @return an instance of evaluator |
| */ |
| public abstract GenericUDAFEvaluator createEvaluator(); |
| |
| public static abstract class DataToSketchEvaluator<U, S extends UpdatableSummary<U>> |
| extends SketchEvaluator<S> { |
| |
| private static final float DEFAULT_SAMPLING_PROBABILITY = 1f; |
| |
| private PrimitiveObjectInspector keyInspector_; |
| private PrimitiveObjectInspector valueInspector_; |
| private PrimitiveObjectInspector samplingProbabilityInspector_; |
| |
| private Mode mode_; |
| |
| @Override |
| public ObjectInspector init(final Mode mode, final ObjectInspector[] inspectors) throws HiveException { |
| super.init(mode, inspectors); |
| mode_ = mode; |
| if (mode == Mode.PARTIAL1 || mode == Mode.COMPLETE) { |
| // input is original data |
| keyInspector_ = (PrimitiveObjectInspector) inspectors[0]; |
| valueInspector_ = (PrimitiveObjectInspector) inspectors[1]; |
| if (inspectors.length > 2) { |
| nominalNumEntriesInspector_ = (PrimitiveObjectInspector) inspectors[2]; |
| } |
| if (inspectors.length > 3) { |
| samplingProbabilityInspector_ = (PrimitiveObjectInspector) inspectors[3]; |
| } |
| } else { |
| // input for PARTIAL2 and FINAL is the output from PARTIAL1 |
| intermediateInspector_ = (StructObjectInspector) inspectors[0]; |
| } |
| |
| if (mode == Mode.PARTIAL1 || mode == Mode.PARTIAL2) { |
| // intermediate results need to include the nominal number of entries |
| return ObjectInspectorFactory.getStandardStructObjectInspector( |
| Arrays.asList(NOMINAL_NUM_ENTRIES_FIELD, SKETCH_FIELD), |
| Arrays.asList( |
| PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.INT), |
| PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.BINARY) |
| ) |
| ); |
| } |
| // final results include just the sketch |
| return PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.BINARY); |
| } |
| |
| @Override |
| public void iterate(final @SuppressWarnings("deprecation") AggregationBuffer buf, final Object[] data) |
| throws HiveException { |
| if (data[0] == null) { return; } |
| @SuppressWarnings("unchecked") |
| final SketchState<U, S> state = (SketchState<U, S>) buf; |
| if (!state.isInitialized()) { |
| initializeState(state, data); |
| } |
| state.update(data[0], keyInspector_, extractValue(data[1], valueInspector_)); |
| } |
| |
| private void initializeState(final SketchState<U, S> state, final Object[] data) { |
| int nominalNumEntries = DEFAULT_NOMINAL_ENTRIES; |
| if (nominalNumEntriesInspector_ != null) { |
| nominalNumEntries = PrimitiveObjectInspectorUtils.getInt(data[2], nominalNumEntriesInspector_); |
| } |
| float samplingProbability = DEFAULT_SAMPLING_PROBABILITY; |
| if (samplingProbabilityInspector_ != null) { |
| samplingProbability = PrimitiveObjectInspectorUtils.getFloat(data[3], |
| samplingProbabilityInspector_); |
| } |
| state.init(nominalNumEntries, samplingProbability, getSummaryFactory(data)); |
| } |
| |
| @SuppressWarnings("deprecation") |
| @Override |
| public AggregationBuffer getNewAggregationBuffer() throws HiveException { |
| if (mode_ == Mode.PARTIAL1 || mode_ == Mode.COMPLETE) { |
| return new SketchState<U, S>(); |
| } |
| return new UnionState<S>(); |
| } |
| |
| /** |
| * Override this if it takes more than a cast to convert Hive value into the sketch update type U |
| * @param data Hive value object |
| * @param valueInspector PrimitiveObjectInspector for the value |
| * @return extracted value |
| * @throws HiveException if anything goes wrong |
| */ |
| public U extractValue(final Object data, final PrimitiveObjectInspector valueInspector) |
| throws HiveException { |
| @SuppressWarnings("unchecked") |
| final U value = (U) valueInspector.getPrimitiveJavaObject(data); |
| return value; |
| } |
| |
| } |
| |
| } |