| /* |
| * 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.frequencies; |
| |
| 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.PrimitiveObjectInspector; |
| import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils; |
| |
| import com.yahoo.sketches.ArrayOfItemsSerDe; |
| |
| /** |
| * This is a generic implementation to be specialized in subclasses |
| * @param <T> type of item |
| */ |
| public abstract class DataToItemsSketchUDAF<T> extends AbstractGenericUDAFResolver { |
| |
| @Override |
| public GenericUDAFEvaluator getEvaluator(final GenericUDAFParameterInfo info) |
| throws SemanticException { |
| final ObjectInspector[] inspectors = info.getParameterObjectInspectors(); |
| if (inspectors.length != 2) { |
| throw new UDFArgumentException("Two arguments expected"); |
| } |
| |
| if (inspectors[0].getCategory() != ObjectInspector.Category.PRIMITIVE) { |
| throw new UDFArgumentTypeException(0, "Primitive argument expected, but " |
| + inspectors[0].getTypeName() + " was recieved"); |
| } |
| |
| if (inspectors[1].getCategory() != ObjectInspector.Category.PRIMITIVE) { |
| throw new UDFArgumentTypeException(0, "Primitive argument expected, but " |
| + inspectors[1].getTypeName() + " was recieved"); |
| } |
| final PrimitiveObjectInspector inspector2 = (PrimitiveObjectInspector) inspectors[1]; |
| if (inspector2.getPrimitiveCategory() != PrimitiveObjectInspector.PrimitiveCategory.INT) { |
| throw new UDFArgumentTypeException(0, "Integer value expected as the second argument, but " |
| + inspector2.getPrimitiveCategory().name() + " was received"); |
| } |
| |
| return createEvaluator(); |
| } |
| |
| public abstract GenericUDAFEvaluator createEvaluator(); |
| |
| public static abstract class DataToItemsSketchEvaluator<T> extends ItemsEvaluator<T> { |
| |
| private PrimitiveObjectInspector maxMapSizeObjectInspector; |
| |
| public DataToItemsSketchEvaluator(final ArrayOfItemsSerDe<T> serDe) { |
| super(serDe); |
| } |
| |
| @Override |
| public ObjectInspector init(final Mode mode, final ObjectInspector[] parameters) |
| throws HiveException { |
| final ObjectInspector result = super.init(mode, parameters); |
| |
| // Parameters: |
| // In PARTIAL1 and COMPLETE mode, the parameters are original data. |
| // In PARTIAL2 and FINAL mode, the parameters are just partial aggregations. |
| if (mode == Mode.PARTIAL1 || mode == Mode.COMPLETE) { |
| if (parameters.length > 1) { |
| maxMapSizeObjectInspector = (PrimitiveObjectInspector) parameters[1]; |
| } |
| } |
| |
| return result; |
| } |
| |
| @SuppressWarnings("deprecation") |
| @Override |
| public void iterate(final AggregationBuffer buf, final Object[] data) throws HiveException { |
| if (data[0] == null) { return; } |
| @SuppressWarnings("unchecked") |
| final ItemsState<T> state = (ItemsState<T>) buf; |
| if (!state.isInitialized()) { |
| final int maxMapSize = PrimitiveObjectInspectorUtils.getInt(data[1], maxMapSizeObjectInspector); |
| state.init(maxMapSize); |
| } |
| state.update(extractValue(data[0], inputObjectInspector)); |
| } |
| |
| public abstract T extractValue(final Object data, final ObjectInspector objectInspector) |
| throws HiveException; |
| |
| } |
| |
| } |