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[FLINK-22726][hive] Support grouping__id in hive prior to 2.3.0
This closes apache#15983
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.../main/java/org/apache/flink/table/module/hive/udf/generic/GenericUDFLegacyGroupingID.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.table.module.hive.udf.generic; | ||
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| import org.apache.flink.table.planner.delegation.hive.HiveParserUtils; | ||
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| import org.apache.hadoop.hive.ql.exec.UDFArgumentException; | ||
| import org.apache.hadoop.hive.ql.exec.UDFArgumentLengthException; | ||
| import org.apache.hadoop.hive.ql.exec.UDFArgumentTypeException; | ||
| import org.apache.hadoop.hive.ql.metadata.HiveException; | ||
| import org.apache.hadoop.hive.ql.udf.generic.GenericUDF; | ||
| import org.apache.hadoop.hive.serde2.objectinspector.ConstantObjectInspector; | ||
| import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector; | ||
| import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector; | ||
| import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory; | ||
| import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils; | ||
| import org.apache.hadoop.io.LongWritable; | ||
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| import java.util.BitSet; | ||
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| /** | ||
| * Hive's GROUPING__ID changed since 2.3.0. This function is to convert the new GROUPING__ID to the | ||
| * legacy value for older Hive versions. See https://issues.apache.org/jira/browse/HIVE-16102 | ||
| */ | ||
| public class GenericUDFLegacyGroupingID extends GenericUDF { | ||
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| public static final String NAME = "_legacy_grouping__id"; | ||
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| private transient PrimitiveObjectInspector groupingIdOI; | ||
| private int numExprs; | ||
| private final LongWritable legacyValue = new LongWritable(); | ||
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| @Override | ||
| public ObjectInspector initialize(ObjectInspector[] arguments) throws UDFArgumentException { | ||
| // we accept two arguments: the new GROUPING__ID and the number of GBY expressions | ||
| if (arguments.length != 2) { | ||
| throw new UDFArgumentLengthException( | ||
| "Expect 2 arguments but actually got " + arguments.length); | ||
| } | ||
| if (arguments[0].getCategory() != ObjectInspector.Category.PRIMITIVE) { | ||
| throw new UDFArgumentTypeException(0, "First argument should be primitive type"); | ||
| } | ||
| if (arguments[1].getCategory() != ObjectInspector.Category.PRIMITIVE) { | ||
| throw new UDFArgumentTypeException(1, "Second argument should be primitive type"); | ||
| } | ||
| groupingIdOI = (PrimitiveObjectInspector) arguments[0]; | ||
| if (groupingIdOI.getPrimitiveCategory() | ||
| != PrimitiveObjectInspector.PrimitiveCategory.LONG) { | ||
| throw new UDFArgumentTypeException(0, "First argument should be a long"); | ||
| } | ||
| PrimitiveObjectInspector numExprOI = (PrimitiveObjectInspector) arguments[1]; | ||
| if (numExprOI.getPrimitiveCategory() != PrimitiveObjectInspector.PrimitiveCategory.INT) { | ||
| throw new UDFArgumentTypeException(1, "Second argument should be an int"); | ||
| } | ||
| if (!(numExprOI instanceof ConstantObjectInspector)) { | ||
| throw new UDFArgumentTypeException(1, "Second argument should be a constant"); | ||
| } | ||
| numExprs = | ||
| PrimitiveObjectInspectorUtils.getInt( | ||
| ((ConstantObjectInspector) numExprOI).getWritableConstantValue(), | ||
| numExprOI); | ||
| if (numExprs < 1 || numExprs > 64) { | ||
| throw new UDFArgumentException( | ||
| "Number of GROUP BY expressions out of range: " + numExprs); | ||
| } | ||
| return PrimitiveObjectInspectorFactory.writableLongObjectInspector; | ||
| } | ||
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| @Override | ||
| public Object evaluate(DeferredObject[] arguments) throws HiveException { | ||
| long groupingId = PrimitiveObjectInspectorUtils.getLong(arguments[0].get(), groupingIdOI); | ||
| BitSet bitSet = BitSet.valueOf(new long[] {groupingId}); | ||
| // flip each bit | ||
| bitSet.flip(0, numExprs); | ||
| // reverse bit order | ||
| int i = 0; | ||
| int j = numExprs - 1; | ||
| while (i < j) { | ||
| bitSet.set(i, bitSet.get(i) ^ bitSet.get(j)); | ||
| bitSet.set(j, bitSet.get(i) ^ bitSet.get(j)); | ||
| bitSet.set(i, bitSet.get(i) ^ bitSet.get(j)); | ||
| i++; | ||
| j--; | ||
| } | ||
| long[] words = bitSet.toLongArray(); | ||
| legacyValue.set(words.length == 0 ? 0L : words[0]); | ||
| return legacyValue; | ||
| } | ||
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| @Override | ||
| public String getDisplayString(String[] children) { | ||
| return HiveParserUtils.getStandardDisplayString("grouping", children); | ||
| } | ||
| } |
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