| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 at |
| * |
| * 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 org.apache.datasketches.hive.hll; |
| |
| import java.util.Arrays; |
| |
| import org.apache.datasketches.hive.common.BytesWritableHelper; |
| import org.apache.datasketches.hll.HllSketch; |
| import org.apache.datasketches.hll.TgtHllType; |
| import org.apache.hadoop.hive.ql.metadata.HiveException; |
| import org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator; |
| import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector; |
| import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector; |
| import org.apache.hadoop.io.BytesWritable; |
| import org.apache.hadoop.io.IntWritable; |
| import org.apache.hadoop.io.Text; |
| |
| // This class implements functionality common to DataToSketch and UnionSketch |
| |
| abstract class SketchEvaluator extends GenericUDAFEvaluator { |
| |
| static final int DEFAULT_LG_K = 12; |
| static final TgtHllType DEFAULT_HLL_TYPE = TgtHllType.HLL_4; |
| |
| protected static final String LG_K_FIELD = "lgK"; |
| protected static final String HLL_TYPE_FIELD = "type"; |
| protected static final String SKETCH_FIELD = "sketch"; |
| |
| protected PrimitiveObjectInspector inputInspector_; |
| protected PrimitiveObjectInspector lgKInspector_; |
| protected PrimitiveObjectInspector hllTypeInspector_; |
| protected StructObjectInspector intermediateInspector_; |
| |
| @Override |
| public Object terminatePartial(final @SuppressWarnings("deprecation") AggregationBuffer buf) |
| throws HiveException { |
| final State state = (State) buf; |
| final HllSketch intermediate = state.getResult(); |
| if (intermediate == null) { return null; } |
| final byte[] bytes = intermediate.toCompactByteArray(); |
| return Arrays.asList( |
| new IntWritable(state.getLgK()), |
| new Text(state.getType().toString()), |
| new BytesWritable(bytes) |
| ); |
| } |
| |
| @Override |
| public void merge(final @SuppressWarnings("deprecation") AggregationBuffer buf, final Object data) |
| throws HiveException { |
| if (data == null) { return; } |
| final UnionState state = (UnionState) buf; |
| if (!state.isInitialized()) { |
| initializeState(state, data); |
| } |
| final BytesWritable serializedSketch = (BytesWritable) this.intermediateInspector_.getStructFieldData( |
| data, this.intermediateInspector_.getStructFieldRef(SKETCH_FIELD)); |
| state.update(HllSketch.wrap(BytesWritableHelper.wrapAsMemory(serializedSketch))); |
| } |
| |
| private void initializeState(final UnionState state, final Object data) { |
| final int lgK = ((IntWritable) this.intermediateInspector_.getStructFieldData( |
| data, this.intermediateInspector_.getStructFieldRef(LG_K_FIELD))).get(); |
| final TgtHllType type = TgtHllType.valueOf(((Text) this.intermediateInspector_.getStructFieldData( |
| data, this.intermediateInspector_.getStructFieldRef(HLL_TYPE_FIELD))).toString()); |
| state.init(lgK, type); |
| } |
| |
| @Override |
| public Object terminate(final @SuppressWarnings("deprecation") AggregationBuffer buf) |
| throws HiveException { |
| final State state = (State) buf; |
| if (state == null) { return null; } |
| final HllSketch result = state.getResult(); |
| if (result == null) { return null; } |
| return new BytesWritable(result.toCompactByteArray()); |
| } |
| |
| @Override |
| public void reset(@SuppressWarnings("deprecation") final AggregationBuffer buf) |
| throws HiveException { |
| final State state = (State) buf; |
| state.reset(); |
| } |
| |
| } |