| /* |
| * 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.pig.backend.hadoop.executionengine.mapReduceLayer; |
| |
| import org.apache.hadoop.conf.Configurable; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hadoop.io.WritableComparator; |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.data.TupleFactory; |
| import org.apache.pig.data.TupleRawComparator; |
| import org.apache.pig.impl.io.NullableTuple; |
| import org.apache.pig.impl.io.PigNullableWritable; |
| |
| public class PigSecondaryKeyComparator extends WritableComparator implements Configurable { |
| |
| private TupleRawComparator mComparator=null; |
| |
| @Override |
| public void setConf(Configuration conf) { |
| try { |
| Class<? extends TupleRawComparator> mComparatorClass = TupleFactory.getInstance().tupleRawComparatorClass(); |
| mComparator = mComparatorClass.newInstance(); |
| } catch (InstantiationException e) { |
| throw new RuntimeException(e); |
| } catch (IllegalAccessException e) { |
| throw new RuntimeException(e); |
| } |
| mComparator.setConf(conf); |
| } |
| |
| protected PigSecondaryKeyComparator() { |
| super(TupleFactory.getInstance().tupleClass()); |
| } |
| |
| @Override |
| public Configuration getConf() { |
| return null; |
| } |
| |
| @Override |
| public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) { |
| |
| // the last byte of a NullableTuple is its Index |
| byte mIndex1 = b1[s1 + l1 - 1]; |
| byte mIndex2 = b2[s2 + l2 - 1]; |
| |
| if ((mIndex1 & NullableTuple.mqFlag) != 0) { // multi-query index |
| if ((mIndex1 & NullableTuple.idxSpace) < (mIndex2 & NullableTuple.idxSpace)) |
| return -1; |
| else if ((mIndex1 & NullableTuple.idxSpace) > (mIndex2 & NullableTuple.idxSpace)) |
| return 1; |
| // if equal, we fall through |
| } |
| int rc = 0; |
| if (b1[s1] == 0 && b2[s2] == 0) { |
| // skip mNull and mIndex |
| rc = mComparator.compare(b1, s1 + 1, l1 - 2, b2, s2 + 1, l2 - 2); |
| // handle PIG-927 |
| // if tuples are equal but any field inside tuple is null, then we do not merge keys |
| if (rc == 0 && mComparator.hasComparedTupleNull()) |
| rc = (mIndex1 & PigNullableWritable.idxSpace) - (mIndex2 & PigNullableWritable.idxSpace); |
| } else { |
| // if they're both null, compare the indexes |
| if (b1[s1] != 0 && b2[s2] != 0) |
| rc = (mIndex1 & PigNullableWritable.idxSpace) - (mIndex2 & PigNullableWritable.idxSpace); |
| // null sorts first |
| else if (b1[s1] != 0) |
| rc = -1; |
| else |
| rc = 1; |
| } |
| return rc; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public int compare(WritableComparable a, WritableComparable b) |
| { |
| PigNullableWritable wa = (PigNullableWritable)a; |
| PigNullableWritable wb = (PigNullableWritable)b; |
| |
| if ((wa.getIndex() & PigNullableWritable.mqFlag) != 0) { // this is a multi-query index |
| if ((wa.getIndex() & PigNullableWritable.idxSpace) < (wb.getIndex() & PigNullableWritable.idxSpace)) |
| return -1; |
| else if ((wa.getIndex() & PigNullableWritable.idxSpace) > (wb.getIndex() & PigNullableWritable.idxSpace)) |
| return 1; |
| // If equal, we fall through |
| } |
| |
| int rc = 0; |
| // If either are null, handle differently. |
| if (!wa.isNull() && !wb.isNull()) { |
| rc = mComparator.compare((Tuple) wa.getValueAsPigType(), (Tuple) wb.getValueAsPigType()); |
| // handle PIG-927 |
| // if tuples are equal but any field inside tuple is null, then we do not merge keys |
| if (rc == 0 && mComparator.hasComparedTupleNull()) |
| rc = (wa.getIndex() & PigNullableWritable.idxSpace) - (wb.getIndex() & PigNullableWritable.idxSpace); |
| } else { |
| // Two nulls are equal if indices are same |
| if (wa.isNull() && wb.isNull()) { |
| if ((wa.getIndex() & PigNullableWritable.idxSpace) < (wb.getIndex() & PigNullableWritable.idxSpace)) |
| rc = -1; |
| else if ((wa.getIndex() & PigNullableWritable.idxSpace) > (wb.getIndex() & PigNullableWritable.idxSpace)) |
| rc = 1; |
| else |
| rc = 0; |
| } |
| else if (wa.isNull()) |
| rc = -1; |
| else |
| rc = 1; |
| } |
| return rc; |
| } |
| } |