org.apache.comet.parquet.ColumnPageReader Maven / Gradle / Ivy
The newest version!
/*
* 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.comet.parquet;
import java.io.IOException;
import java.util.ArrayDeque;
import java.util.List;
import java.util.Queue;
import org.apache.parquet.bytes.BytesInput;
import org.apache.parquet.column.page.DataPage;
import org.apache.parquet.column.page.DataPageV1;
import org.apache.parquet.column.page.DataPageV2;
import org.apache.parquet.column.page.DictionaryPage;
import org.apache.parquet.column.page.PageReader;
import org.apache.parquet.compression.CompressionCodecFactory;
import org.apache.parquet.crypto.AesCipher;
import org.apache.parquet.crypto.ModuleCipherFactory;
import org.apache.parquet.format.BlockCipher;
import org.apache.parquet.internal.column.columnindex.OffsetIndex;
import org.apache.parquet.io.ParquetDecodingException;
public class ColumnPageReader implements PageReader {
private final CompressionCodecFactory.BytesInputDecompressor decompressor;
private final long valueCount;
private final Queue compressedPages;
private final DictionaryPage compressedDictionaryPage;
private final OffsetIndex offsetIndex;
private final long rowCount;
private int pageIndex = 0;
private final BlockCipher.Decryptor blockDecryptor;
private final byte[] dataPageAAD;
private final byte[] dictionaryPageAAD;
ColumnPageReader(
CompressionCodecFactory.BytesInputDecompressor decompressor,
List compressedPages,
DictionaryPage compressedDictionaryPage,
OffsetIndex offsetIndex,
long rowCount,
BlockCipher.Decryptor blockDecryptor,
byte[] fileAAD,
int rowGroupOrdinal,
int columnOrdinal) {
this.decompressor = decompressor;
this.compressedPages = new ArrayDeque<>(compressedPages);
this.compressedDictionaryPage = compressedDictionaryPage;
long count = 0;
for (DataPage p : compressedPages) {
count += p.getValueCount();
}
this.valueCount = count;
this.offsetIndex = offsetIndex;
this.rowCount = rowCount;
this.blockDecryptor = blockDecryptor;
if (blockDecryptor != null) {
dataPageAAD =
AesCipher.createModuleAAD(
fileAAD, ModuleCipherFactory.ModuleType.DataPage, rowGroupOrdinal, columnOrdinal, 0);
dictionaryPageAAD =
AesCipher.createModuleAAD(
fileAAD,
ModuleCipherFactory.ModuleType.DictionaryPage,
rowGroupOrdinal,
columnOrdinal,
-1);
} else {
dataPageAAD = null;
dictionaryPageAAD = null;
}
}
@Override
public long getTotalValueCount() {
return valueCount;
}
/** Returns the total value count of the current page. */
public int getPageValueCount() {
return compressedPages.element().getValueCount();
}
/** Skips the current page so it won't be returned by {@link #readPage()} */
public void skipPage() {
compressedPages.poll();
pageIndex++;
}
@Override
public DataPage readPage() {
final DataPage compressedPage = compressedPages.poll();
if (compressedPage == null) {
return null;
}
final int currentPageIndex = pageIndex++;
if (null != blockDecryptor) {
AesCipher.quickUpdatePageAAD(dataPageAAD, getPageOrdinal(currentPageIndex));
}
return compressedPage.accept(
new DataPage.Visitor() {
@Override
public DataPage visit(DataPageV1 dataPageV1) {
try {
BytesInput bytes = dataPageV1.getBytes();
if (null != blockDecryptor) {
bytes = BytesInput.from(blockDecryptor.decrypt(bytes.toByteArray(), dataPageAAD));
}
BytesInput decompressed =
decompressor.decompress(bytes, dataPageV1.getUncompressedSize());
final DataPageV1 decompressedPage;
if (offsetIndex == null) {
decompressedPage =
new DataPageV1(
decompressed,
dataPageV1.getValueCount(),
dataPageV1.getUncompressedSize(),
dataPageV1.getStatistics(),
dataPageV1.getRlEncoding(),
dataPageV1.getDlEncoding(),
dataPageV1.getValueEncoding());
} else {
long firstRowIndex = offsetIndex.getFirstRowIndex(currentPageIndex);
decompressedPage =
new DataPageV1(
decompressed,
dataPageV1.getValueCount(),
dataPageV1.getUncompressedSize(),
firstRowIndex,
Math.toIntExact(
offsetIndex.getLastRowIndex(currentPageIndex, rowCount)
- firstRowIndex
+ 1),
dataPageV1.getStatistics(),
dataPageV1.getRlEncoding(),
dataPageV1.getDlEncoding(),
dataPageV1.getValueEncoding());
}
if (dataPageV1.getCrc().isPresent()) {
decompressedPage.setCrc(dataPageV1.getCrc().getAsInt());
}
return decompressedPage;
} catch (IOException e) {
throw new ParquetDecodingException("could not decompress page", e);
}
}
@Override
public DataPage visit(DataPageV2 dataPageV2) {
if (!dataPageV2.isCompressed() && offsetIndex == null && null == blockDecryptor) {
return dataPageV2;
}
BytesInput pageBytes = dataPageV2.getData();
if (null != blockDecryptor) {
try {
pageBytes =
BytesInput.from(blockDecryptor.decrypt(pageBytes.toByteArray(), dataPageAAD));
} catch (IOException e) {
throw new ParquetDecodingException(
"could not convert page ByteInput to byte array", e);
}
}
if (dataPageV2.isCompressed()) {
int uncompressedSize =
Math.toIntExact(
dataPageV2.getUncompressedSize()
- dataPageV2.getDefinitionLevels().size()
- dataPageV2.getRepetitionLevels().size());
try {
pageBytes = decompressor.decompress(pageBytes, uncompressedSize);
} catch (IOException e) {
throw new ParquetDecodingException("could not decompress page", e);
}
}
if (offsetIndex == null) {
return DataPageV2.uncompressed(
dataPageV2.getRowCount(),
dataPageV2.getNullCount(),
dataPageV2.getValueCount(),
dataPageV2.getRepetitionLevels(),
dataPageV2.getDefinitionLevels(),
dataPageV2.getDataEncoding(),
pageBytes,
dataPageV2.getStatistics());
} else {
return DataPageV2.uncompressed(
dataPageV2.getRowCount(),
dataPageV2.getNullCount(),
dataPageV2.getValueCount(),
offsetIndex.getFirstRowIndex(currentPageIndex),
dataPageV2.getRepetitionLevels(),
dataPageV2.getDefinitionLevels(),
dataPageV2.getDataEncoding(),
pageBytes,
dataPageV2.getStatistics());
}
}
});
}
@Override
public DictionaryPage readDictionaryPage() {
if (compressedDictionaryPage == null) {
return null;
}
try {
BytesInput bytes = compressedDictionaryPage.getBytes();
if (null != blockDecryptor) {
bytes = BytesInput.from(blockDecryptor.decrypt(bytes.toByteArray(), dictionaryPageAAD));
}
DictionaryPage decompressedPage =
new DictionaryPage(
decompressor.decompress(bytes, compressedDictionaryPage.getUncompressedSize()),
compressedDictionaryPage.getDictionarySize(),
compressedDictionaryPage.getEncoding());
if (compressedDictionaryPage.getCrc().isPresent()) {
decompressedPage.setCrc(compressedDictionaryPage.getCrc().getAsInt());
}
return decompressedPage;
} catch (IOException e) {
throw new ParquetDecodingException("Could not decompress dictionary page", e);
}
}
private int getPageOrdinal(int currentPageIndex) {
return offsetIndex == null ? currentPageIndex : offsetIndex.getPageOrdinal(currentPageIndex);
}
}