| /* |
| * 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.quantiles; |
| |
| import java.util.Comparator; |
| |
| import org.apache.hadoop.hive.ql.exec.UDFArgumentException; |
| 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.PrimitiveCategory; |
| 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 |
| */ |
| @SuppressWarnings("javadoc") |
| public abstract class UnionItemsSketchUDAF<T> extends AbstractGenericUDAFResolver { |
| |
| @Override |
| public GenericUDAFEvaluator getEvaluator(final GenericUDAFParameterInfo info) throws SemanticException { |
| final ObjectInspector[] inspectors = info.getParameterObjectInspectors(); |
| if ((inspectors.length != 1) && (inspectors.length != 2)) { |
| throw new UDFArgumentException("One or two arguments expected"); |
| } |
| ObjectInspectorValidator.validateGivenPrimitiveCategory(inspectors[0], 0, PrimitiveCategory.BINARY); |
| if (inspectors.length == 2) { |
| ObjectInspectorValidator.validateGivenPrimitiveCategory(inspectors[1], 1, PrimitiveCategory.INT); |
| } |
| return createEvaluator(); |
| } |
| |
| public abstract GenericUDAFEvaluator createEvaluator(); |
| |
| public static class UnionEvaluator<T> extends ItemsEvaluator<T> { |
| |
| UnionEvaluator(final Comparator<? super T> comparator, final ArrayOfItemsSerDe<T> serDe) { |
| super(comparator, serDe); |
| } |
| |
| @SuppressWarnings("deprecation") |
| @Override |
| public void iterate(final AggregationBuffer buf, final Object[] data) throws HiveException { |
| if (data[0] == null) { return; } |
| @SuppressWarnings("unchecked") |
| final ItemsUnionState<T> state = (ItemsUnionState<T>) buf; |
| if (!state.isInitialized()) { |
| int k = 0; |
| if (kObjectInspector != null) { |
| k = PrimitiveObjectInspectorUtils.getInt(data[1], kObjectInspector); |
| } |
| state.init(k); |
| } |
| merge(buf, data[0]); |
| } |
| |
| } |
| |
| } |