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BloomFilterIO.java
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138 lines (125 loc) · 4.38 KB
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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.
*/
package org.apache.orc.util;
import com.google.protobuf.ByteString;
import org.apache.orc.OrcFile;
import org.apache.orc.OrcProto;
import org.apache.orc.TypeDescription;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
/**
* @since 1.3.0
*/
public class BloomFilterIO {
public enum Encoding {
ORIGINAL(0),
UTF8_UTC(1),
FUTURE(Integer.MAX_VALUE);
public static final Encoding CURRENT = UTF8_UTC;
private final int id;
Encoding(int id) {
this.id = id;
}
public int getId() {
return id;
}
public static Encoding from(OrcProto.ColumnEncoding encoding) {
if (!encoding.hasBloomEncoding()) {
return ORIGINAL;
}
switch (encoding.getBloomEncoding()) {
case 0:
return ORIGINAL;
case 1:
return UTF8_UTC;
default:
return FUTURE;
}
}
}
private BloomFilterIO() {
// never called
}
/**
* Deserialize a bloom filter from the ORC file.
*/
public static BloomFilter deserialize(OrcProto.Stream.Kind kind,
OrcProto.ColumnEncoding encoding,
OrcFile.WriterVersion fileVersion,
TypeDescription.Category type,
OrcProto.BloomFilter bloomFilter) {
if (bloomFilter == null) {
return null;
}
int numFuncs = bloomFilter.getNumHashFunctions();
switch (kind) {
case BLOOM_FILTER: {
long[] values = new long[bloomFilter.getBitsetCount()];
for (int i = 0; i < values.length; ++i) {
values[i] = bloomFilter.getBitset(i);
}
// After HIVE-12055 the bloom filters for strings correctly use
// UTF8.
if (fileVersion.includes(OrcFile.WriterVersion.HIVE_12055) &&
(type == TypeDescription.Category.STRING ||
type == TypeDescription.Category.CHAR ||
type == TypeDescription.Category.VARCHAR)) {
return new BloomFilterUtf8(values, numFuncs);
}
return new BloomFilter(values, numFuncs);
}
case BLOOM_FILTER_UTF8: {
// make sure we don't use unknown encodings or original timestamp encodings
Encoding version = Encoding.from(encoding);
if (version == Encoding.FUTURE ||
(type == TypeDescription.Category.TIMESTAMP &&
version == Encoding.ORIGINAL)) {
return null;
}
ByteString bits = bloomFilter.getUtf8Bitset();
long[] values = new long[bits.size() / 8];
bits.asReadOnlyByteBuffer().order(ByteOrder.LITTLE_ENDIAN)
.asLongBuffer().get(values);
return new BloomFilterUtf8(values, numFuncs);
}
default:
throw new IllegalArgumentException("Unknown bloom filter kind " + kind);
}
}
/**
* Serialize the BloomFilter to the ORC file.
* @param builder the builder to write to
* @param bloomFilter the bloom filter to serialize
*/
public static void serialize(OrcProto.BloomFilter.Builder builder,
BloomFilter bloomFilter) {
builder.clear();
builder.setNumHashFunctions(bloomFilter.getNumHashFunctions());
long[] bitset = bloomFilter.getBitSet();
if (bloomFilter instanceof BloomFilterUtf8) {
ByteBuffer buffer = ByteBuffer.allocate(bitset.length * 8);
buffer.order(ByteOrder.LITTLE_ENDIAN);
buffer.asLongBuffer().put(bitset);
builder.setUtf8Bitset(ByteString.copyFrom(buffer));
} else {
for(int i=0; i < bitset.length; ++i) {
builder.addBitset(bitset[i]);
}
}
}
}