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metadata.cc
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metadata.cc
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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.
#include <algorithm>
#include <ostream>
#include <string>
#include <utility>
#include "arrow/util/logging.h"
#include "parquet/exception.h"
#include "parquet/metadata.h"
#include "parquet/schema-internal.h"
#include "parquet/schema.h"
#include "parquet/statistics.h"
#include "parquet/thrift.h"
#include <boost/regex.hpp> // IWYU pragma: keep
namespace parquet {
const ApplicationVersion& ApplicationVersion::PARQUET_251_FIXED_VERSION() {
static ApplicationVersion version("parquet-mr", 1, 8, 0);
return version;
}
const ApplicationVersion& ApplicationVersion::PARQUET_816_FIXED_VERSION() {
static ApplicationVersion version("parquet-mr", 1, 2, 9);
return version;
}
const ApplicationVersion& ApplicationVersion::PARQUET_CPP_FIXED_STATS_VERSION() {
static ApplicationVersion version("parquet-cpp", 1, 3, 0);
return version;
}
const ApplicationVersion& ApplicationVersion::PARQUET_MR_FIXED_STATS_VERSION() {
static ApplicationVersion version("parquet-mr", 1, 10, 0);
return version;
}
std::string ParquetVersionToString(ParquetVersion::type ver) {
switch (ver) {
case ParquetVersion::PARQUET_1_0:
return "1.0";
case ParquetVersion::PARQUET_2_0:
return "2.0";
}
// This should be unreachable
return "UNKNOWN";
}
template <typename DType>
static std::shared_ptr<Statistics> MakeTypedColumnStats(
const format::ColumnMetaData& metadata, const ColumnDescriptor* descr) {
// If ColumnOrder is defined, return max_value and min_value
if (descr->column_order().get_order() == ColumnOrder::TYPE_DEFINED_ORDER) {
return TypedStatistics<DType>::Make(
descr, metadata.statistics.min_value, metadata.statistics.max_value,
metadata.num_values - metadata.statistics.null_count,
metadata.statistics.null_count, metadata.statistics.distinct_count,
metadata.statistics.__isset.max_value || metadata.statistics.__isset.min_value);
}
// Default behavior
return TypedStatistics<DType>::Make(
descr, metadata.statistics.min, metadata.statistics.max,
metadata.num_values - metadata.statistics.null_count,
metadata.statistics.null_count, metadata.statistics.distinct_count,
metadata.statistics.__isset.max || metadata.statistics.__isset.min);
}
std::shared_ptr<Statistics> MakeColumnStats(const format::ColumnMetaData& meta_data,
const ColumnDescriptor* descr) {
switch (static_cast<Type::type>(meta_data.type)) {
case Type::BOOLEAN:
return MakeTypedColumnStats<BooleanType>(meta_data, descr);
case Type::INT32:
return MakeTypedColumnStats<Int32Type>(meta_data, descr);
case Type::INT64:
return MakeTypedColumnStats<Int64Type>(meta_data, descr);
case Type::INT96:
return MakeTypedColumnStats<Int96Type>(meta_data, descr);
case Type::DOUBLE:
return MakeTypedColumnStats<DoubleType>(meta_data, descr);
case Type::FLOAT:
return MakeTypedColumnStats<FloatType>(meta_data, descr);
case Type::BYTE_ARRAY:
return MakeTypedColumnStats<ByteArrayType>(meta_data, descr);
case Type::FIXED_LEN_BYTE_ARRAY:
return MakeTypedColumnStats<FLBAType>(meta_data, descr);
case Type::UNDEFINED:
break;
}
throw ParquetException("Can't decode page statistics for selected column type");
}
// MetaData Accessor
// ColumnChunk metadata
class ColumnChunkMetaData::ColumnChunkMetaDataImpl {
public:
explicit ColumnChunkMetaDataImpl(const format::ColumnChunk* column,
const ColumnDescriptor* descr,
const ApplicationVersion* writer_version)
: column_(column), descr_(descr), writer_version_(writer_version) {
const format::ColumnMetaData& meta_data = column->meta_data;
for (auto encoding : meta_data.encodings) {
encodings_.push_back(FromThrift(encoding));
}
possible_stats_ = nullptr;
}
// column chunk
inline int64_t file_offset() const { return column_->file_offset; }
inline const std::string& file_path() const { return column_->file_path; }
// column metadata
inline Type::type type() const { return FromThrift(column_->meta_data.type); }
inline int64_t num_values() const { return column_->meta_data.num_values; }
std::shared_ptr<schema::ColumnPath> path_in_schema() {
return std::make_shared<schema::ColumnPath>(column_->meta_data.path_in_schema);
}
// Check if statistics are set and are valid
// 1) Must be set in the metadata
// 2) Statistics must not be corrupted
inline bool is_stats_set() const {
DCHECK(writer_version_ != nullptr);
// If the column statistics don't exist or column sort order is unknown
// we cannot use the column stats
if (!column_->meta_data.__isset.statistics ||
descr_->sort_order() == SortOrder::UNKNOWN) {
return false;
}
if (possible_stats_ == nullptr) {
possible_stats_ = MakeColumnStats(column_->meta_data, descr_);
}
EncodedStatistics encodedStatistics = possible_stats_->Encode();
return writer_version_->HasCorrectStatistics(type(), encodedStatistics,
descr_->sort_order());
}
inline std::shared_ptr<Statistics> statistics() const {
return is_stats_set() ? possible_stats_ : nullptr;
}
inline Compression::type compression() const {
return FromThrift(column_->meta_data.codec);
}
const std::vector<Encoding::type>& encodings() const { return encodings_; }
inline bool has_dictionary_page() const {
return column_->meta_data.__isset.dictionary_page_offset;
}
inline int64_t dictionary_page_offset() const {
return column_->meta_data.dictionary_page_offset;
}
inline int64_t data_page_offset() const { return column_->meta_data.data_page_offset; }
inline bool has_index_page() const {
return column_->meta_data.__isset.index_page_offset;
}
inline int64_t index_page_offset() const {
return column_->meta_data.index_page_offset;
}
inline int64_t total_compressed_size() const {
return column_->meta_data.total_compressed_size;
}
inline int64_t total_uncompressed_size() const {
return column_->meta_data.total_uncompressed_size;
}
private:
mutable std::shared_ptr<Statistics> possible_stats_;
std::vector<Encoding::type> encodings_;
const format::ColumnChunk* column_;
const ColumnDescriptor* descr_;
const ApplicationVersion* writer_version_;
};
std::unique_ptr<ColumnChunkMetaData> ColumnChunkMetaData::Make(
const void* metadata, const ColumnDescriptor* descr,
const ApplicationVersion* writer_version) {
return std::unique_ptr<ColumnChunkMetaData>(
new ColumnChunkMetaData(metadata, descr, writer_version));
}
ColumnChunkMetaData::ColumnChunkMetaData(const void* metadata,
const ColumnDescriptor* descr,
const ApplicationVersion* writer_version)
: impl_{std::unique_ptr<ColumnChunkMetaDataImpl>(new ColumnChunkMetaDataImpl(
reinterpret_cast<const format::ColumnChunk*>(metadata), descr,
writer_version))} {}
ColumnChunkMetaData::~ColumnChunkMetaData() {}
// column chunk
int64_t ColumnChunkMetaData::file_offset() const { return impl_->file_offset(); }
const std::string& ColumnChunkMetaData::file_path() const { return impl_->file_path(); }
// column metadata
Type::type ColumnChunkMetaData::type() const { return impl_->type(); }
int64_t ColumnChunkMetaData::num_values() const { return impl_->num_values(); }
std::shared_ptr<schema::ColumnPath> ColumnChunkMetaData::path_in_schema() const {
return impl_->path_in_schema();
}
std::shared_ptr<Statistics> ColumnChunkMetaData::statistics() const {
return impl_->statistics();
}
bool ColumnChunkMetaData::is_stats_set() const { return impl_->is_stats_set(); }
bool ColumnChunkMetaData::has_dictionary_page() const {
return impl_->has_dictionary_page();
}
int64_t ColumnChunkMetaData::dictionary_page_offset() const {
return impl_->dictionary_page_offset();
}
int64_t ColumnChunkMetaData::data_page_offset() const {
return impl_->data_page_offset();
}
bool ColumnChunkMetaData::has_index_page() const { return impl_->has_index_page(); }
int64_t ColumnChunkMetaData::index_page_offset() const {
return impl_->index_page_offset();
}
Compression::type ColumnChunkMetaData::compression() const {
return impl_->compression();
}
const std::vector<Encoding::type>& ColumnChunkMetaData::encodings() const {
return impl_->encodings();
}
int64_t ColumnChunkMetaData::total_uncompressed_size() const {
return impl_->total_uncompressed_size();
}
int64_t ColumnChunkMetaData::total_compressed_size() const {
return impl_->total_compressed_size();
}
// row-group metadata
class RowGroupMetaData::RowGroupMetaDataImpl {
public:
explicit RowGroupMetaDataImpl(const format::RowGroup* row_group,
const SchemaDescriptor* schema,
const ApplicationVersion* writer_version)
: row_group_(row_group), schema_(schema), writer_version_(writer_version) {}
inline int num_columns() const { return static_cast<int>(row_group_->columns.size()); }
inline int64_t num_rows() const { return row_group_->num_rows; }
inline int64_t total_byte_size() const { return row_group_->total_byte_size; }
inline const SchemaDescriptor* schema() const { return schema_; }
std::unique_ptr<ColumnChunkMetaData> ColumnChunk(int i) {
if (!(i < num_columns())) {
std::stringstream ss;
ss << "The file only has " << num_columns()
<< " columns, requested metadata for column: " << i;
throw ParquetException(ss.str());
}
return ColumnChunkMetaData::Make(&row_group_->columns[i], schema_->Column(i),
writer_version_);
}
private:
const format::RowGroup* row_group_;
const SchemaDescriptor* schema_;
const ApplicationVersion* writer_version_;
};
std::unique_ptr<RowGroupMetaData> RowGroupMetaData::Make(
const void* metadata, const SchemaDescriptor* schema,
const ApplicationVersion* writer_version) {
return std::unique_ptr<RowGroupMetaData>(
new RowGroupMetaData(metadata, schema, writer_version));
}
RowGroupMetaData::RowGroupMetaData(const void* metadata, const SchemaDescriptor* schema,
const ApplicationVersion* writer_version)
: impl_{std::unique_ptr<RowGroupMetaDataImpl>(new RowGroupMetaDataImpl(
reinterpret_cast<const format::RowGroup*>(metadata), schema, writer_version))} {
}
RowGroupMetaData::~RowGroupMetaData() {}
int RowGroupMetaData::num_columns() const { return impl_->num_columns(); }
int64_t RowGroupMetaData::num_rows() const { return impl_->num_rows(); }
int64_t RowGroupMetaData::total_byte_size() const { return impl_->total_byte_size(); }
const SchemaDescriptor* RowGroupMetaData::schema() const { return impl_->schema(); }
std::unique_ptr<ColumnChunkMetaData> RowGroupMetaData::ColumnChunk(int i) const {
return impl_->ColumnChunk(i);
}
// file metadata
class FileMetaData::FileMetaDataImpl {
public:
FileMetaDataImpl() : metadata_len_(0) {}
explicit FileMetaDataImpl(const void* metadata, uint32_t* metadata_len)
: metadata_len_(0) {
metadata_.reset(new format::FileMetaData);
DeserializeThriftMsg(reinterpret_cast<const uint8_t*>(metadata), metadata_len,
metadata_.get());
metadata_len_ = *metadata_len;
if (metadata_->__isset.created_by) {
writer_version_ = ApplicationVersion(metadata_->created_by);
} else {
writer_version_ = ApplicationVersion("unknown 0.0.0");
}
InitSchema();
InitColumnOrders();
InitKeyValueMetadata();
}
inline uint32_t size() const { return metadata_len_; }
inline int num_columns() const { return schema_.num_columns(); }
inline int64_t num_rows() const { return metadata_->num_rows; }
inline int num_row_groups() const {
return static_cast<int>(metadata_->row_groups.size());
}
inline int32_t version() const { return metadata_->version; }
inline const std::string& created_by() const { return metadata_->created_by; }
inline int num_schema_elements() const {
return static_cast<int>(metadata_->schema.size());
}
const ApplicationVersion& writer_version() const { return writer_version_; }
void WriteTo(::arrow::io::OutputStream* dst) const {
ThriftSerializer serializer;
serializer.Serialize(metadata_.get(), dst);
}
std::unique_ptr<RowGroupMetaData> RowGroup(int i) {
if (!(i < num_row_groups())) {
std::stringstream ss;
ss << "The file only has " << num_row_groups()
<< " row groups, requested metadata for row group: " << i;
throw ParquetException(ss.str());
}
return RowGroupMetaData::Make(&metadata_->row_groups[i], &schema_, &writer_version_);
}
const SchemaDescriptor* schema() const { return &schema_; }
std::shared_ptr<const KeyValueMetadata> key_value_metadata() const {
return key_value_metadata_;
}
void set_file_path(const std::string& path) {
for (format::RowGroup& row_group : metadata_->row_groups) {
for (format::ColumnChunk& chunk : row_group.columns) {
chunk.__set_file_path(path);
}
}
}
format::RowGroup& row_group(int i) {
DCHECK_LT(i, num_row_groups());
return metadata_->row_groups[i];
}
void AppendRowGroups(const std::unique_ptr<FileMetaDataImpl>& other) {
format::RowGroup other_rg;
for (int i = 0; i < other->num_row_groups(); i++) {
other_rg = other->row_group(i);
metadata_->row_groups.push_back(other_rg);
metadata_->num_rows += other_rg.num_rows;
}
}
private:
friend FileMetaDataBuilder;
uint32_t metadata_len_;
std::unique_ptr<format::FileMetaData> metadata_;
void InitSchema() {
schema::FlatSchemaConverter converter(&metadata_->schema[0],
static_cast<int>(metadata_->schema.size()));
schema_.Init(converter.Convert());
}
void InitColumnOrders() {
// update ColumnOrder
std::vector<parquet::ColumnOrder> column_orders;
if (metadata_->__isset.column_orders) {
for (auto column_order : metadata_->column_orders) {
if (column_order.__isset.TYPE_ORDER) {
column_orders.push_back(ColumnOrder::type_defined_);
} else {
column_orders.push_back(ColumnOrder::undefined_);
}
}
} else {
column_orders.resize(schema_.num_columns(), ColumnOrder::undefined_);
}
schema_.updateColumnOrders(column_orders);
}
SchemaDescriptor schema_;
ApplicationVersion writer_version_;
void InitKeyValueMetadata() {
std::shared_ptr<KeyValueMetadata> metadata = nullptr;
if (metadata_->__isset.key_value_metadata) {
metadata = std::make_shared<KeyValueMetadata>();
for (const auto& it : metadata_->key_value_metadata) {
metadata->Append(it.key, it.value);
}
}
key_value_metadata_ = metadata;
}
std::shared_ptr<const KeyValueMetadata> key_value_metadata_;
};
std::shared_ptr<FileMetaData> FileMetaData::Make(const void* metadata,
uint32_t* metadata_len) {
// This FileMetaData ctor is private, not compatible with std::make_shared
return std::shared_ptr<FileMetaData>(new FileMetaData(metadata, metadata_len));
}
FileMetaData::FileMetaData(const void* metadata, uint32_t* metadata_len)
: impl_{std::unique_ptr<FileMetaDataImpl>(
new FileMetaDataImpl(metadata, metadata_len))} {}
FileMetaData::FileMetaData()
: impl_{std::unique_ptr<FileMetaDataImpl>(new FileMetaDataImpl())} {}
FileMetaData::~FileMetaData() {}
std::unique_ptr<RowGroupMetaData> FileMetaData::RowGroup(int i) const {
return impl_->RowGroup(i);
}
uint32_t FileMetaData::size() const { return impl_->size(); }
int FileMetaData::num_columns() const { return impl_->num_columns(); }
int64_t FileMetaData::num_rows() const { return impl_->num_rows(); }
int FileMetaData::num_row_groups() const { return impl_->num_row_groups(); }
ParquetVersion::type FileMetaData::version() const {
switch (impl_->version()) {
case 1:
return ParquetVersion::PARQUET_1_0;
case 2:
return ParquetVersion::PARQUET_2_0;
default:
// Improperly set version, assuming Parquet 1.0
break;
}
return ParquetVersion::PARQUET_1_0;
}
const ApplicationVersion& FileMetaData::writer_version() const {
return impl_->writer_version();
}
const std::string& FileMetaData::created_by() const { return impl_->created_by(); }
int FileMetaData::num_schema_elements() const { return impl_->num_schema_elements(); }
const SchemaDescriptor* FileMetaData::schema() const { return impl_->schema(); }
std::shared_ptr<const KeyValueMetadata> FileMetaData::key_value_metadata() const {
return impl_->key_value_metadata();
}
void FileMetaData::set_file_path(const std::string& path) { impl_->set_file_path(path); }
void FileMetaData::AppendRowGroups(const FileMetaData& other) {
impl_->AppendRowGroups(other.impl_);
}
void FileMetaData::WriteTo(::arrow::io::OutputStream* dst) const {
return impl_->WriteTo(dst);
}
ApplicationVersion::ApplicationVersion(const std::string& application, int major,
int minor, int patch)
: application_(application), version{major, minor, patch, "", "", ""} {}
ApplicationVersion::ApplicationVersion(const std::string& created_by) {
boost::regex app_regex{ApplicationVersion::APPLICATION_FORMAT};
boost::regex ver_regex{ApplicationVersion::VERSION_FORMAT};
boost::smatch app_matches;
boost::smatch ver_matches;
std::string created_by_lower = created_by;
std::transform(created_by_lower.begin(), created_by_lower.end(),
created_by_lower.begin(), ::tolower);
bool app_success = boost::regex_match(created_by_lower, app_matches, app_regex);
bool ver_success = false;
std::string version_str;
if (app_success && app_matches.size() >= 4) {
// first match is the entire string. sub-matches start from second.
application_ = app_matches[1];
version_str = app_matches[3];
build_ = app_matches[4];
ver_success = boost::regex_match(version_str, ver_matches, ver_regex);
} else {
application_ = "unknown";
}
if (ver_success && ver_matches.size() >= 7) {
version.major = atoi(ver_matches[1].str().c_str());
version.minor = atoi(ver_matches[2].str().c_str());
version.patch = atoi(ver_matches[3].str().c_str());
version.unknown = ver_matches[4].str();
version.pre_release = ver_matches[5].str();
version.build_info = ver_matches[6].str();
} else {
version.major = 0;
version.minor = 0;
version.patch = 0;
}
}
bool ApplicationVersion::VersionLt(const ApplicationVersion& other_version) const {
if (application_ != other_version.application_) return false;
if (version.major < other_version.version.major) return true;
if (version.major > other_version.version.major) return false;
DCHECK_EQ(version.major, other_version.version.major);
if (version.minor < other_version.version.minor) return true;
if (version.minor > other_version.version.minor) return false;
DCHECK_EQ(version.minor, other_version.version.minor);
return version.patch < other_version.version.patch;
}
bool ApplicationVersion::VersionEq(const ApplicationVersion& other_version) const {
return application_ == other_version.application_ &&
version.major == other_version.version.major &&
version.minor == other_version.version.minor &&
version.patch == other_version.version.patch;
}
// Reference:
// parquet-mr/parquet-column/src/main/java/org/apache/parquet/CorruptStatistics.java
// PARQUET-686 has more disussion on statistics
bool ApplicationVersion::HasCorrectStatistics(Type::type col_type,
EncodedStatistics& statistics,
SortOrder::type sort_order) const {
// parquet-cpp version 1.3.0 and parquet-mr 1.10.0 onwards stats are computed
// correctly for all types
if ((application_ == "parquet-cpp" && VersionLt(PARQUET_CPP_FIXED_STATS_VERSION())) ||
(application_ == "parquet-mr" && VersionLt(PARQUET_MR_FIXED_STATS_VERSION()))) {
// Only SIGNED are valid unless max and min are the same
// (in which case the sort order does not matter)
bool max_equals_min = statistics.has_min && statistics.has_max
? statistics.min() == statistics.max()
: false;
if (SortOrder::SIGNED != sort_order && !max_equals_min) {
return false;
}
// Statistics of other types are OK
if (col_type != Type::FIXED_LEN_BYTE_ARRAY && col_type != Type::BYTE_ARRAY) {
return true;
}
}
// created_by is not populated, which could have been caused by
// parquet-mr during the same time as PARQUET-251, see PARQUET-297
if (application_ == "unknown") {
return true;
}
// Unknown sort order has incorrect stats
if (SortOrder::UNKNOWN == sort_order) {
return false;
}
// PARQUET-251
if (VersionLt(PARQUET_251_FIXED_VERSION())) {
return false;
}
return true;
}
// MetaData Builders
// row-group metadata
class ColumnChunkMetaDataBuilder::ColumnChunkMetaDataBuilderImpl {
public:
explicit ColumnChunkMetaDataBuilderImpl(const std::shared_ptr<WriterProperties>& props,
const ColumnDescriptor* column)
: owned_column_chunk_(new format::ColumnChunk),
properties_(props),
column_(column) {
Init(owned_column_chunk_.get());
}
explicit ColumnChunkMetaDataBuilderImpl(const std::shared_ptr<WriterProperties>& props,
const ColumnDescriptor* column,
format::ColumnChunk* column_chunk)
: properties_(props), column_(column) {
Init(column_chunk);
}
const void* contents() const { return column_chunk_; }
// column chunk
void set_file_path(const std::string& val) { column_chunk_->__set_file_path(val); }
// column metadata
void SetStatistics(const EncodedStatistics& val) {
column_chunk_->meta_data.__set_statistics(ToThrift(val));
}
void Finish(int64_t num_values, int64_t dictionary_page_offset,
int64_t index_page_offset, int64_t data_page_offset,
int64_t compressed_size, int64_t uncompressed_size, bool has_dictionary,
bool dictionary_fallback) {
if (dictionary_page_offset > 0) {
column_chunk_->meta_data.__set_dictionary_page_offset(dictionary_page_offset);
column_chunk_->__set_file_offset(dictionary_page_offset + compressed_size);
} else {
column_chunk_->__set_file_offset(data_page_offset + compressed_size);
}
column_chunk_->__isset.meta_data = true;
column_chunk_->meta_data.__set_num_values(num_values);
if (index_page_offset >= 0) {
column_chunk_->meta_data.__set_index_page_offset(index_page_offset);
}
column_chunk_->meta_data.__set_data_page_offset(data_page_offset);
column_chunk_->meta_data.__set_total_uncompressed_size(uncompressed_size);
column_chunk_->meta_data.__set_total_compressed_size(compressed_size);
std::vector<format::Encoding::type> thrift_encodings;
if (has_dictionary) {
thrift_encodings.push_back(ToThrift(properties_->dictionary_index_encoding()));
if (properties_->version() == ParquetVersion::PARQUET_1_0) {
thrift_encodings.push_back(ToThrift(Encoding::PLAIN));
} else {
thrift_encodings.push_back(ToThrift(properties_->dictionary_page_encoding()));
}
} else { // Dictionary not enabled
thrift_encodings.push_back(ToThrift(properties_->encoding(column_->path())));
}
thrift_encodings.push_back(ToThrift(Encoding::RLE));
// Only PLAIN encoding is supported for fallback in V1
// TODO(majetideepak): Use user specified encoding for V2
if (dictionary_fallback) {
thrift_encodings.push_back(ToThrift(Encoding::PLAIN));
}
column_chunk_->meta_data.__set_encodings(thrift_encodings);
}
void WriteTo(::arrow::io::OutputStream* sink) {
ThriftSerializer serializer;
serializer.Serialize(column_chunk_, sink);
}
const ColumnDescriptor* descr() const { return column_; }
private:
void Init(format::ColumnChunk* column_chunk) {
column_chunk_ = column_chunk;
column_chunk_->meta_data.__set_type(ToThrift(column_->physical_type()));
column_chunk_->meta_data.__set_path_in_schema(column_->path()->ToDotVector());
column_chunk_->meta_data.__set_codec(
ToThrift(properties_->compression(column_->path())));
}
format::ColumnChunk* column_chunk_;
std::unique_ptr<format::ColumnChunk> owned_column_chunk_;
const std::shared_ptr<WriterProperties> properties_;
const ColumnDescriptor* column_;
};
std::unique_ptr<ColumnChunkMetaDataBuilder> ColumnChunkMetaDataBuilder::Make(
const std::shared_ptr<WriterProperties>& props, const ColumnDescriptor* column,
void* contents) {
return std::unique_ptr<ColumnChunkMetaDataBuilder>(
new ColumnChunkMetaDataBuilder(props, column, contents));
}
std::unique_ptr<ColumnChunkMetaDataBuilder> ColumnChunkMetaDataBuilder::Make(
const std::shared_ptr<WriterProperties>& props, const ColumnDescriptor* column) {
return std::unique_ptr<ColumnChunkMetaDataBuilder>(
new ColumnChunkMetaDataBuilder(props, column));
}
ColumnChunkMetaDataBuilder::ColumnChunkMetaDataBuilder(
const std::shared_ptr<WriterProperties>& props, const ColumnDescriptor* column)
: impl_{std::unique_ptr<ColumnChunkMetaDataBuilderImpl>(
new ColumnChunkMetaDataBuilderImpl(props, column))} {}
ColumnChunkMetaDataBuilder::ColumnChunkMetaDataBuilder(
const std::shared_ptr<WriterProperties>& props, const ColumnDescriptor* column,
void* contents)
: impl_{std::unique_ptr<ColumnChunkMetaDataBuilderImpl>(
new ColumnChunkMetaDataBuilderImpl(
props, column, reinterpret_cast<format::ColumnChunk*>(contents)))} {}
ColumnChunkMetaDataBuilder::~ColumnChunkMetaDataBuilder() {}
const void* ColumnChunkMetaDataBuilder::contents() const { return impl_->contents(); }
void ColumnChunkMetaDataBuilder::set_file_path(const std::string& path) {
impl_->set_file_path(path);
}
void ColumnChunkMetaDataBuilder::Finish(int64_t num_values,
int64_t dictionary_page_offset,
int64_t index_page_offset,
int64_t data_page_offset, int64_t compressed_size,
int64_t uncompressed_size, bool has_dictionary,
bool dictionary_fallback) {
impl_->Finish(num_values, dictionary_page_offset, index_page_offset, data_page_offset,
compressed_size, uncompressed_size, has_dictionary, dictionary_fallback);
}
void ColumnChunkMetaDataBuilder::WriteTo(::arrow::io::OutputStream* sink) {
impl_->WriteTo(sink);
}
const ColumnDescriptor* ColumnChunkMetaDataBuilder::descr() const {
return impl_->descr();
}
void ColumnChunkMetaDataBuilder::SetStatistics(const EncodedStatistics& result) {
impl_->SetStatistics(result);
}
class RowGroupMetaDataBuilder::RowGroupMetaDataBuilderImpl {
public:
explicit RowGroupMetaDataBuilderImpl(const std::shared_ptr<WriterProperties>& props,
const SchemaDescriptor* schema, void* contents)
: properties_(props), schema_(schema), current_column_(0) {
row_group_ = reinterpret_cast<format::RowGroup*>(contents);
InitializeColumns(schema->num_columns());
}
ColumnChunkMetaDataBuilder* NextColumnChunk() {
if (!(current_column_ < num_columns())) {
std::stringstream ss;
ss << "The schema only has " << num_columns()
<< " columns, requested metadata for column: " << current_column_;
throw ParquetException(ss.str());
}
auto column = schema_->Column(current_column_);
auto column_builder = ColumnChunkMetaDataBuilder::Make(
properties_, column, &row_group_->columns[current_column_++]);
auto column_builder_ptr = column_builder.get();
column_builders_.push_back(std::move(column_builder));
return column_builder_ptr;
}
int current_column() { return current_column_; }
void Finish(int64_t total_bytes_written) {
if (!(current_column_ == schema_->num_columns())) {
std::stringstream ss;
ss << "Only " << current_column_ - 1 << " out of " << schema_->num_columns()
<< " columns are initialized";
throw ParquetException(ss.str());
}
int64_t total_byte_size = 0;
for (int i = 0; i < schema_->num_columns(); i++) {
if (!(row_group_->columns[i].file_offset >= 0)) {
std::stringstream ss;
ss << "Column " << i << " is not complete.";
throw ParquetException(ss.str());
}
total_byte_size += row_group_->columns[i].meta_data.total_compressed_size;
}
DCHECK(total_bytes_written == total_byte_size)
<< "Total bytes in this RowGroup does not match with compressed sizes of columns";
row_group_->__set_total_byte_size(total_byte_size);
}
void set_num_rows(int64_t num_rows) { row_group_->num_rows = num_rows; }
int num_columns() { return static_cast<int>(row_group_->columns.size()); }
int64_t num_rows() { return row_group_->num_rows; }
private:
void InitializeColumns(int ncols) { row_group_->columns.resize(ncols); }
format::RowGroup* row_group_;
const std::shared_ptr<WriterProperties> properties_;
const SchemaDescriptor* schema_;
std::vector<std::unique_ptr<ColumnChunkMetaDataBuilder>> column_builders_;
int current_column_;
};
std::unique_ptr<RowGroupMetaDataBuilder> RowGroupMetaDataBuilder::Make(
const std::shared_ptr<WriterProperties>& props, const SchemaDescriptor* schema_,
void* contents) {
return std::unique_ptr<RowGroupMetaDataBuilder>(
new RowGroupMetaDataBuilder(props, schema_, contents));
}
RowGroupMetaDataBuilder::RowGroupMetaDataBuilder(
const std::shared_ptr<WriterProperties>& props, const SchemaDescriptor* schema_,
void* contents)
: impl_{std::unique_ptr<RowGroupMetaDataBuilderImpl>(
new RowGroupMetaDataBuilderImpl(props, schema_, contents))} {}
RowGroupMetaDataBuilder::~RowGroupMetaDataBuilder() {}
ColumnChunkMetaDataBuilder* RowGroupMetaDataBuilder::NextColumnChunk() {
return impl_->NextColumnChunk();
}
int RowGroupMetaDataBuilder::current_column() const { return impl_->current_column(); }
int RowGroupMetaDataBuilder::num_columns() { return impl_->num_columns(); }
int64_t RowGroupMetaDataBuilder::num_rows() { return impl_->num_rows(); }
void RowGroupMetaDataBuilder::set_num_rows(int64_t num_rows) {
impl_->set_num_rows(num_rows);
}
void RowGroupMetaDataBuilder::Finish(int64_t total_bytes_written) {
impl_->Finish(total_bytes_written);
}
// file metadata
// TODO(PARQUET-595) Support key_value_metadata
class FileMetaDataBuilder::FileMetaDataBuilderImpl {
public:
explicit FileMetaDataBuilderImpl(
const SchemaDescriptor* schema, const std::shared_ptr<WriterProperties>& props,
const std::shared_ptr<const KeyValueMetadata>& key_value_metadata)
: properties_(props), schema_(schema), key_value_metadata_(key_value_metadata) {
metadata_.reset(new format::FileMetaData());
}
RowGroupMetaDataBuilder* AppendRowGroup() {
row_groups_.emplace_back();
current_row_group_builder_ =
RowGroupMetaDataBuilder::Make(properties_, schema_, &row_groups_.back());
return current_row_group_builder_.get();
}
std::unique_ptr<FileMetaData> Finish() {
int64_t total_rows = 0;
for (auto row_group : row_groups_) {
total_rows += row_group.num_rows;
}
metadata_->__set_num_rows(total_rows);
metadata_->__set_row_groups(row_groups_);
if (key_value_metadata_) {
metadata_->key_value_metadata.clear();
metadata_->key_value_metadata.reserve(key_value_metadata_->size());
for (int64_t i = 0; i < key_value_metadata_->size(); ++i) {
format::KeyValue kv_pair;
kv_pair.__set_key(key_value_metadata_->key(i));
kv_pair.__set_value(key_value_metadata_->value(i));
metadata_->key_value_metadata.push_back(kv_pair);
}
metadata_->__isset.key_value_metadata = true;
}
int32_t file_version = 0;
switch (properties_->version()) {
case ParquetVersion::PARQUET_1_0:
file_version = 1;
break;
case ParquetVersion::PARQUET_2_0:
file_version = 2;
break;
default:
break;
}
metadata_->__set_version(file_version);
metadata_->__set_created_by(properties_->created_by());
// Users cannot set the `ColumnOrder` since we donot not have user defined sort order
// in the spec yet.
// We always default to `TYPE_DEFINED_ORDER`. We can expose it in
// the API once we have user defined sort orders in the Parquet format.
// TypeDefinedOrder implies choose SortOrder based on ConvertedType/PhysicalType
format::TypeDefinedOrder type_defined_order;
format::ColumnOrder column_order;
column_order.__set_TYPE_ORDER(type_defined_order);
column_order.__isset.TYPE_ORDER = true;
metadata_->column_orders.resize(schema_->num_columns(), column_order);
metadata_->__isset.column_orders = true;
parquet::schema::SchemaFlattener flattener(
static_cast<parquet::schema::GroupNode*>(schema_->schema_root().get()),
&metadata_->schema);
flattener.Flatten();
auto file_meta_data = std::unique_ptr<FileMetaData>(new FileMetaData());
file_meta_data->impl_->metadata_ = std::move(metadata_);
file_meta_data->impl_->InitSchema();
return file_meta_data;
}
protected:
std::unique_ptr<format::FileMetaData> metadata_;
private:
const std::shared_ptr<WriterProperties> properties_;
std::vector<format::RowGroup> row_groups_;
std::unique_ptr<RowGroupMetaDataBuilder> current_row_group_builder_;
const SchemaDescriptor* schema_;
std::shared_ptr<const KeyValueMetadata> key_value_metadata_;
};
std::unique_ptr<FileMetaDataBuilder> FileMetaDataBuilder::Make(
const SchemaDescriptor* schema, const std::shared_ptr<WriterProperties>& props,
const std::shared_ptr<const KeyValueMetadata>& key_value_metadata) {
return std::unique_ptr<FileMetaDataBuilder>(
new FileMetaDataBuilder(schema, props, key_value_metadata));
}
FileMetaDataBuilder::FileMetaDataBuilder(
const SchemaDescriptor* schema, const std::shared_ptr<WriterProperties>& props,
const std::shared_ptr<const KeyValueMetadata>& key_value_metadata)
: impl_{std::unique_ptr<FileMetaDataBuilderImpl>(
new FileMetaDataBuilderImpl(schema, props, key_value_metadata))} {}
FileMetaDataBuilder::~FileMetaDataBuilder() {}
RowGroupMetaDataBuilder* FileMetaDataBuilder::AppendRowGroup() {
return impl_->AppendRowGroup();
}
std::unique_ptr<FileMetaData> FileMetaDataBuilder::Finish() { return impl_->Finish(); }
} // namespace parquet