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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.parquet.hadoop.metadata;
import java.util.Set;
import org.apache.parquet.column.Encoding;
import org.apache.parquet.column.EncodingStats;
import org.apache.parquet.column.statistics.BooleanStatistics;
import org.apache.parquet.column.statistics.Statistics;
import org.apache.parquet.schema.PrimitiveType.PrimitiveTypeName;
/**
* Column meta data for a block stored in the file footer and passed in the InputSplit
* @author Julien Le Dem
*/
abstract public class ColumnChunkMetaData {
@Deprecated
public static ColumnChunkMetaData get(
ColumnPath path,
PrimitiveTypeName type,
CompressionCodecName codec,
Set encodings,
long firstDataPage,
long dictionaryPageOffset,
long valueCount,
long totalSize,
long totalUncompressedSize) {
return get(
path, type, codec, null, encodings, new BooleanStatistics(), firstDataPage,
dictionaryPageOffset, valueCount, totalSize, totalUncompressedSize);
}
@Deprecated
public static ColumnChunkMetaData get(
ColumnPath path,
PrimitiveTypeName type,
CompressionCodecName codec,
Set encodings,
Statistics statistics,
long firstDataPage,
long dictionaryPageOffset,
long valueCount,
long totalSize,
long totalUncompressedSize) {
return get(
path, type, codec, null, encodings, statistics, firstDataPage, dictionaryPageOffset,
valueCount, totalSize, totalUncompressedSize);
}
public static ColumnChunkMetaData get(
ColumnPath path,
PrimitiveTypeName type,
CompressionCodecName codec,
EncodingStats encodingStats,
Set encodings,
Statistics statistics,
long firstDataPage,
long dictionaryPageOffset,
long valueCount,
long totalSize,
long totalUncompressedSize) {
// to save space we store those always positive longs in ints when they fit.
if (positiveLongFitsInAnInt(firstDataPage)
&& positiveLongFitsInAnInt(dictionaryPageOffset)
&& positiveLongFitsInAnInt(valueCount)
&& positiveLongFitsInAnInt(totalSize)
&& positiveLongFitsInAnInt(totalUncompressedSize)) {
return new IntColumnChunkMetaData(
path, type, codec,
encodingStats, encodings,
statistics,
firstDataPage,
dictionaryPageOffset,
valueCount,
totalSize,
totalUncompressedSize);
} else {
return new LongColumnChunkMetaData(
path, type, codec,
encodingStats, encodings,
statistics,
firstDataPage,
dictionaryPageOffset,
valueCount,
totalSize,
totalUncompressedSize);
}
}
/**
* @return the offset of the first byte in the chunk
*/
public long getStartingPos() {
long dictionaryPageOffset = getDictionaryPageOffset();
long firstDataPageOffset = getFirstDataPageOffset();
if (dictionaryPageOffset > 0 && dictionaryPageOffset < firstDataPageOffset) {
// if there's a dictionary and it's before the first data page, start from there
return dictionaryPageOffset;
}
return firstDataPageOffset;
}
/**
* checks that a positive long value fits in an int.
* (reindexed on Integer.MIN_VALUE)
* @param value
* @return whether it fits
*/
protected static boolean positiveLongFitsInAnInt(long value) {
return (value >= 0) && (value + Integer.MIN_VALUE <= Integer.MAX_VALUE);
}
private final EncodingStats encodingStats;
// we save 3 references by storing together the column properties that have few distinct values
private final ColumnChunkProperties properties;
protected ColumnChunkMetaData(ColumnChunkProperties columnChunkProperties) {
this(null, columnChunkProperties);
}
protected ColumnChunkMetaData(EncodingStats encodingStats, ColumnChunkProperties columnChunkProperties) {
this.encodingStats = encodingStats;
this.properties = columnChunkProperties;
}
public CompressionCodecName getCodec() {
return properties.getCodec();
}
/**
*
* @return column identifier
*/
public ColumnPath getPath() {
return properties.getPath();
}
/**
* @return type of the column
*/
public PrimitiveTypeName getType() {
return properties.getType();
}
/**
* @return start of the column data offset
*/
abstract public long getFirstDataPageOffset();
/**
* @return the location of the dictionary page if any
*/
abstract public long getDictionaryPageOffset();
/**
* @return count of values in this block of the column
*/
abstract public long getValueCount();
/**
* @return the totalUncompressedSize
*/
abstract public long getTotalUncompressedSize();
/**
* @return the totalSize
*/
abstract public long getTotalSize();
/**
* @return the stats for this column
*/
abstract public Statistics getStatistics();
/**
* @return all the encodings used in this column
*/
public Set getEncodings() {
return properties.getEncodings();
}
public EncodingStats getEncodingStats() {
return encodingStats;
}
@Override
public String toString() {
return "ColumnMetaData{" + properties.toString() + ", " + getFirstDataPageOffset() + "}";
}
}
class IntColumnChunkMetaData extends ColumnChunkMetaData {
private final int firstDataPage;
private final int dictionaryPageOffset;
private final int valueCount;
private final int totalSize;
private final int totalUncompressedSize;
private final Statistics statistics;
/**
* @param path column identifier
* @param type type of the column
* @param codec
* @param encodings
* @param statistics
* @param firstDataPage
* @param dictionaryPageOffset
* @param valueCount
* @param totalSize
* @param totalUncompressedSize
*/
IntColumnChunkMetaData(
ColumnPath path,
PrimitiveTypeName type,
CompressionCodecName codec,
EncodingStats encodingStats,
Set encodings,
Statistics statistics,
long firstDataPage,
long dictionaryPageOffset,
long valueCount,
long totalSize,
long totalUncompressedSize) {
super(encodingStats, ColumnChunkProperties.get(path, type, codec, encodings));
this.firstDataPage = positiveLongToInt(firstDataPage);
this.dictionaryPageOffset = positiveLongToInt(dictionaryPageOffset);
this.valueCount = positiveLongToInt(valueCount);
this.totalSize = positiveLongToInt(totalSize);
this.totalUncompressedSize = positiveLongToInt(totalUncompressedSize);
this.statistics = statistics;
}
/**
* stores a positive long into an int (assuming it fits)
* @param value
* @return
*/
private int positiveLongToInt(long value) {
if (!ColumnChunkMetaData.positiveLongFitsInAnInt(value)) {
throw new IllegalArgumentException("value should be positive and fit in an int: " + value);
}
return (int)(value + Integer.MIN_VALUE);
}
/**
* turns the int back into a positive long
* @param value
* @return
*/
private long intToPositiveLong(int value) {
return (long)value - Integer.MIN_VALUE;
}
/**
* @return start of the column data offset
*/
public long getFirstDataPageOffset() {
return intToPositiveLong(firstDataPage);
}
/**
* @return the location of the dictionary page if any
*/
public long getDictionaryPageOffset() {
return intToPositiveLong(dictionaryPageOffset);
}
/**
* @return count of values in this block of the column
*/
public long getValueCount() {
return intToPositiveLong(valueCount);
}
/**
* @return the totalUncompressedSize
*/
public long getTotalUncompressedSize() {
return intToPositiveLong(totalUncompressedSize);
}
/**
* @return the totalSize
*/
public long getTotalSize() {
return intToPositiveLong(totalSize);
}
/**
* @return the stats for this column
*/
public Statistics getStatistics() {
return statistics;
}
}
class LongColumnChunkMetaData extends ColumnChunkMetaData {
private final long firstDataPageOffset;
private final long dictionaryPageOffset;
private final long valueCount;
private final long totalSize;
private final long totalUncompressedSize;
private final Statistics statistics;
/**
* @param path column identifier
* @param type type of the column
* @param codec
* @param encodings
* @param statistics
* @param firstDataPageOffset
* @param dictionaryPageOffset
* @param valueCount
* @param totalSize
* @param totalUncompressedSize
*/
LongColumnChunkMetaData(
ColumnPath path,
PrimitiveTypeName type,
CompressionCodecName codec,
EncodingStats encodingStats,
Set encodings,
Statistics statistics,
long firstDataPageOffset,
long dictionaryPageOffset,
long valueCount,
long totalSize,
long totalUncompressedSize) {
super(encodingStats, ColumnChunkProperties.get(path, type, codec, encodings));
this.firstDataPageOffset = firstDataPageOffset;
this.dictionaryPageOffset = dictionaryPageOffset;
this.valueCount = valueCount;
this.totalSize = totalSize;
this.totalUncompressedSize = totalUncompressedSize;
this.statistics = statistics;
}
/**
* @return start of the column data offset
*/
public long getFirstDataPageOffset() {
return firstDataPageOffset;
}
/**
* @return the location of the dictionary page if any
*/
public long getDictionaryPageOffset() {
return dictionaryPageOffset;
}
/**
* @return count of values in this block of the column
*/
public long getValueCount() {
return valueCount;
}
/**
* @return the totalUncompressedSize
*/
public long getTotalUncompressedSize() {
return totalUncompressedSize;
}
/**
* @return the totalSize
*/
public long getTotalSize() {
return totalSize;
}
/**
* @return the stats for this column
*/
public Statistics getStatistics() {
return statistics;
}
}
