com.yahoo.sketches.hive.quantiles.UnionDoublesSketchUDAF Maven / Gradle / Ivy
/*
* 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 org.apache.hadoop.hive.ql.exec.Description;
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;
@Description(name = "Union", value = "_FUNC_(sketch) - "
+ "Returns a QuantilesSketch in a serialized form as a binary blob."
+ " Input values are also serialized sketches.")
public class UnionDoublesSketchUDAF 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 new UnionEvaluator();
}
static class UnionEvaluator extends DoublesEvaluator {
@SuppressWarnings("deprecation")
@Override
public void iterate(final AggregationBuffer buf, final Object[] data) throws HiveException {
if (data[0] == null) { return; }
final DoublesUnionState state = (DoublesUnionState) buf;
if (!state.isInitialized()) {
int k = 0;
if (kObjectInspector != null) {
k = PrimitiveObjectInspectorUtils.getInt(data[1], kObjectInspector);
}
state.init(k);
}
merge(buf, data[0]);
}
}
}