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parquet.format.converter.ParquetMetadataConverter Maven / Gradle / Ivy
/**
* Copyright 2012 Twitter, Inc.
*
* Licensed 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 parquet.format.converter;
import static parquet.format.Util.readFileMetaData;
import static parquet.format.Util.writePageHeader;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import parquet.Log;
import parquet.format.ColumnChunk;
import parquet.format.DataPageHeader;
import parquet.format.DictionaryPageHeader;
import parquet.format.Encoding;
import parquet.format.FieldRepetitionType;
import parquet.format.FileMetaData;
import parquet.format.KeyValue;
import parquet.format.PageHeader;
import parquet.format.PageType;
import parquet.format.RowGroup;
import parquet.format.SchemaElement;
import parquet.format.Type;
import parquet.hadoop.metadata.BlockMetaData;
import parquet.hadoop.metadata.ColumnChunkMetaData;
import parquet.hadoop.metadata.ColumnPath;
import parquet.hadoop.metadata.CompressionCodecName;
import parquet.hadoop.metadata.ParquetMetadata;
import parquet.io.ParquetDecodingException;
import parquet.schema.GroupType;
import parquet.schema.MessageType;
import parquet.schema.PrimitiveType;
import parquet.schema.PrimitiveType.PrimitiveTypeName;
import parquet.schema.Type.Repetition;
import parquet.schema.TypeVisitor;
public class ParquetMetadataConverter {
private static final Log LOG = Log.getLog(ParquetMetadataConverter.class);
public FileMetaData toParquetMetadata(int currentVersion, ParquetMetadata parquetMetadata) {
List blocks = parquetMetadata.getBlocks();
List rowGroups = new ArrayList();
int numRows = 0;
for (BlockMetaData block : blocks) {
numRows += block.getRowCount();
addRowGroup(parquetMetadata, rowGroups, block);
}
FileMetaData fileMetaData = new FileMetaData(
currentVersion,
toParquetSchema(parquetMetadata.getFileMetaData().getSchema()),
numRows,
rowGroups);
Set> keyValues = parquetMetadata.getFileMetaData().getKeyValueMetaData().entrySet();
for (Entry keyValue : keyValues) {
addKeyValue(fileMetaData, keyValue.getKey(), keyValue.getValue());
}
fileMetaData.setCreated_by(parquetMetadata.getFileMetaData().getCreatedBy());
return fileMetaData;
}
List toParquetSchema(MessageType schema) {
List result = new ArrayList();
addToList(result, schema);
return result;
}
private void addToList(final List result, parquet.schema.Type field) {
field.accept(new TypeVisitor() {
@Override
public void visit(PrimitiveType primitiveType) {
SchemaElement element = new SchemaElement(primitiveType.getName());
element.setRepetition_type(toParquetRepetition(primitiveType.getRepetition()));
element.setType(getType(primitiveType.getPrimitiveTypeName()));
if (primitiveType.getTypeLength() > 0) {
element.setType_length(primitiveType.getTypeLength());
}
result.add(element);
}
@Override
public void visit(MessageType messageType) {
SchemaElement element = new SchemaElement(messageType.getName());
visitChildren(result, messageType.asGroupType(), element);
}
@Override
public void visit(GroupType groupType) {
SchemaElement element = new SchemaElement(groupType.getName());
element.setRepetition_type(toParquetRepetition(groupType.getRepetition()));
visitChildren(result, groupType, element);
}
private void visitChildren(final List result,
GroupType groupType, SchemaElement element) {
element.setNum_children(groupType.getFieldCount());
result.add(element);
for (parquet.schema.Type field : groupType.getFields()) {
addToList(result, field);
}
}
});
}
private void addRowGroup(ParquetMetadata parquetMetadata, List rowGroups, BlockMetaData block) {
//rowGroup.total_byte_size = ;
List columns = block.getColumns();
List parquetColumns = new ArrayList();
for (ColumnChunkMetaData columnMetaData : columns) {
ColumnChunk columnChunk = new ColumnChunk(columnMetaData.getFirstDataPageOffset()); // verify this is the right offset
columnChunk.file_path = block.getPath(); // they are in the same file for now
columnChunk.meta_data = new parquet.format.ColumnMetaData(
getType(columnMetaData.getType()),
toFormatEncodings(columnMetaData.getEncodings()),
Arrays.asList(columnMetaData.getPath().toArray()),
columnMetaData.getCodec().getParquetCompressionCodec(),
columnMetaData.getValueCount(),
columnMetaData.getTotalUncompressedSize(),
columnMetaData.getTotalSize(),
columnMetaData.getFirstDataPageOffset());
columnChunk.meta_data.dictionary_page_offset = columnMetaData.getDictionaryPageOffset();
// columnChunk.meta_data.index_page_offset = ;
// columnChunk.meta_data.key_value_metadata = ; // nothing yet
parquetColumns.add(columnChunk);
}
RowGroup rowGroup = new RowGroup(parquetColumns, block.getTotalByteSize(), block.getRowCount());
rowGroups.add(rowGroup);
}
private List toFormatEncodings(Set encodings) {
List converted = new ArrayList(encodings.size());
for (parquet.column.Encoding encoding : encodings) {
converted.add(getEncoding(encoding));
}
return converted;
}
private static final class EncodingList {
private final Set encodings;
public EncodingList(Set encodings) {
this.encodings = encodings;
}
@Override
public boolean equals(Object obj) {
if (obj instanceof EncodingList) {
Set other = ((EncodingList)obj).encodings;
return other.size() == encodings.size() && encodings.containsAll(other);
}
return false;
}
@Override
public int hashCode() {
int result = 1;
for (parquet.column.Encoding element : encodings)
result = 31 * result + (element == null ? 0 : element.hashCode());
return result;
}
}
private Map> encodingLists = new HashMap>();
private Set fromFormatEncodings(List encodings) {
Set converted = new HashSet();
for (Encoding encoding : encodings) {
converted.add(getEncoding(encoding));
}
converted = Collections.unmodifiableSet(converted);
EncodingList key = new EncodingList(converted);
Set cached = encodingLists.get(key);
if (cached == null) {
cached = converted;
encodingLists.put(key, cached);
}
return cached;
}
public parquet.column.Encoding getEncoding(Encoding encoding) {
return parquet.column.Encoding.valueOf(encoding.name());
}
public Encoding getEncoding(parquet.column.Encoding encoding) {
return Encoding.valueOf(encoding.name());
}
PrimitiveTypeName getPrimitive(Type type) {
switch (type) {
case BYTE_ARRAY: // TODO: rename BINARY and remove this switch
return PrimitiveTypeName.BINARY;
case INT64:
return PrimitiveTypeName.INT64;
case INT32:
return PrimitiveTypeName.INT32;
case BOOLEAN:
return PrimitiveTypeName.BOOLEAN;
case FLOAT:
return PrimitiveTypeName.FLOAT;
case DOUBLE:
return PrimitiveTypeName.DOUBLE;
case INT96:
return PrimitiveTypeName.INT96;
case FIXED_LEN_BYTE_ARRAY:
return PrimitiveTypeName.FIXED_LEN_BYTE_ARRAY;
default:
throw new RuntimeException("Unknown type " + type);
}
}
Type getType(PrimitiveTypeName type) {
switch (type) {
case INT64:
return Type.INT64;
case INT32:
return Type.INT32;
case BOOLEAN:
return Type.BOOLEAN;
case BINARY:
return Type.BYTE_ARRAY;
case FLOAT:
return Type.FLOAT;
case DOUBLE:
return Type.DOUBLE;
case INT96:
return Type.INT96;
case FIXED_LEN_BYTE_ARRAY:
return Type.FIXED_LEN_BYTE_ARRAY;
default:
throw new RuntimeException("Unknown type " + type);
}
}
private void addKeyValue(FileMetaData fileMetaData, String key, String value) {
KeyValue keyValue = new KeyValue(key);
keyValue.value = value;
fileMetaData.addToKey_value_metadata(keyValue);
}
public ParquetMetadata readParquetMetadata(InputStream from) throws IOException {
FileMetaData fileMetaData = readFileMetaData(from);
if (Log.DEBUG) LOG.debug(fileMetaData);
ParquetMetadata parquetMetadata = fromParquetMetadata(fileMetaData);
if (Log.DEBUG) LOG.debug(ParquetMetadata.toPrettyJSON(parquetMetadata));
return parquetMetadata;
}
public ParquetMetadata fromParquetMetadata(FileMetaData parquetMetadata) throws IOException {
MessageType messageType = fromParquetSchema(parquetMetadata.getSchema());
List blocks = new ArrayList();
List row_groups = parquetMetadata.getRow_groups();
for (RowGroup rowGroup : row_groups) {
BlockMetaData blockMetaData = new BlockMetaData();
blockMetaData.setRowCount(rowGroup.getNum_rows());
blockMetaData.setTotalByteSize(rowGroup.getTotal_byte_size());
List columns = rowGroup.getColumns();
String filePath = columns.get(0).getFile_path();
for (ColumnChunk columnChunk : columns) {
if ((filePath == null && columnChunk.getFile_path() != null)
|| (filePath != null && !filePath.equals(columnChunk.getFile_path()))) {
throw new ParquetDecodingException("all column chunks of the same row group must be in the same file for now");
}
parquet.format.ColumnMetaData metaData = columnChunk.meta_data;
ColumnPath path = getPath(metaData);
ColumnChunkMetaData column = ColumnChunkMetaData.get(
path,
messageType.getType(path.toArray()).asPrimitiveType().getPrimitiveTypeName(),
CompressionCodecName.fromParquet(metaData.codec),
fromFormatEncodings(metaData.encodings),
metaData.data_page_offset,
metaData.dictionary_page_offset,
metaData.num_values,
metaData.total_compressed_size,
metaData.total_uncompressed_size);
// TODO
// index_page_offset
// key_value_metadata
blockMetaData.addColumn(column);
}
blockMetaData.setPath(filePath);
blocks.add(blockMetaData);
}
Map keyValueMetaData = new HashMap();
List key_value_metadata = parquetMetadata.getKey_value_metadata();
if (key_value_metadata != null) {
for (KeyValue keyValue : key_value_metadata) {
keyValueMetaData.put(keyValue.key, keyValue.value);
}
}
return new ParquetMetadata(
new parquet.hadoop.metadata.FileMetaData(messageType, keyValueMetaData, parquetMetadata.getCreated_by()),
blocks);
}
private ColumnPath getPath(parquet.format.ColumnMetaData metaData) {
String[] path = metaData.path_in_schema.toArray(new String[metaData.path_in_schema.size()]);
return ColumnPath.get(path);
}
MessageType fromParquetSchema(List schema) {
Iterator iterator = schema.iterator();
SchemaElement root = iterator.next();
return new MessageType(root.getName(), convertChildren(iterator, root.getNum_children()));
}
private parquet.schema.Type[] convertChildren(Iterator schema, int childrenCount) {
parquet.schema.Type[] result = new parquet.schema.Type[childrenCount];
for (int i = 0; i < result.length; i++) {
SchemaElement schemaElement = schema.next();
if ((!schemaElement.isSetType() && !schemaElement.isSetNum_children())
|| (schemaElement.isSetType() && schemaElement.isSetNum_children())) {
throw new RuntimeException("bad element " + schemaElement);
}
Repetition repetition = fromParquetRepetition(schemaElement.getRepetition_type());
String name = schemaElement.getName();
if (schemaElement.type != null) {
if (schemaElement.isSetType_length()) {
result[i] = new PrimitiveType(
repetition,
getPrimitive(schemaElement.getType()),
schemaElement.type_length,
name);
} else {
result[i] = new PrimitiveType(
repetition,
getPrimitive(schemaElement.getType()),
name);
}
} else {
result[i] = new GroupType(
repetition,
name,
convertChildren(schema, schemaElement.getNum_children()));
}
}
return result;
}
FieldRepetitionType toParquetRepetition(Repetition repetition) {
return FieldRepetitionType.valueOf(repetition.name());
}
Repetition fromParquetRepetition(FieldRepetitionType repetition) {
return Repetition.valueOf(repetition.name());
}
public void writeDataPageHeader(
int uncompressedSize,
int compressedSize,
int valueCount,
parquet.column.Encoding rlEncoding,
parquet.column.Encoding dlEncoding,
parquet.column.Encoding valuesEncoding,
OutputStream to) throws IOException {
writePageHeader(newDataPageHeader(uncompressedSize, compressedSize, valueCount, rlEncoding, dlEncoding, valuesEncoding), to);
}
private PageHeader newDataPageHeader(
int uncompressedSize, int compressedSize,
int valueCount,
parquet.column.Encoding rlEncoding,
parquet.column.Encoding dlEncoding,
parquet.column.Encoding valuesEncoding) {
PageHeader pageHeader = new PageHeader(PageType.DATA_PAGE, uncompressedSize, compressedSize);
// TODO: pageHeader.crc = ...;
pageHeader.data_page_header = new DataPageHeader(
valueCount,
getEncoding(valuesEncoding),
getEncoding(dlEncoding),
getEncoding(rlEncoding));
return pageHeader;
}
public void writeDictionaryPageHeader(
int uncompressedSize, int compressedSize, int valueCount,
parquet.column.Encoding valuesEncoding, OutputStream to) throws IOException {
PageHeader pageHeader = new PageHeader(PageType.DICTIONARY_PAGE, uncompressedSize, compressedSize);
pageHeader.dictionary_page_header = new DictionaryPageHeader(valueCount, getEncoding(valuesEncoding));
writePageHeader(pageHeader, to);
}
}
