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#include <arrow/io/file.h>
#include <parquet/stream_reader.h>
#include <iostream>
#include <memory>
#include <string>
#include <sstream>
using std::cout;
using std::cerr;
using std::endl;
int main(int argc, char** argv)
{
if (argc < 2)
return EXIT_FAILURE;
const char* filepath = argv[1];
std::shared_ptr<arrow::io::ReadableFile> infile;
PARQUET_ASSIGN_OR_THROW(
infile,
arrow::io::ReadableFile::Open(filepath));
auto file_reader = parquet::ParquetFileReader::Open(infile);
auto file_md = file_reader->metadata();
const parquet::FileMetaData& r = *file_md;
cout << "num-columns: " << r.num_columns() << endl;
cout << "num-rows: " << r.num_rows() << endl;
cout << "num-row-groups: " << r.num_row_groups() << endl;
cout << "num-schema-elements: " << r.num_schema_elements() << endl;
cout << "can-decompress: " << r.can_decompress() << endl;
for (int i = 0; i < r.num_row_groups(); ++i)
{
cout << "row-group " << i << ":" << endl;
auto rg = r.RowGroup(i);
cout << " num rows: " << rg->num_rows() << endl;
cout << " total byte size: " << rg->total_byte_size() << endl;
cout << " total compressed size: " << rg->total_compressed_size() << endl;
cout << " file offset: " << rg->file_offset() << endl;
cout << " num columns: " << rg->num_columns() << endl;
for (int j = 0; j < rg->num_columns(); ++j)
{
cout << " column chunk " << j << ":" << endl;
auto cc = rg->ColumnChunk(j);
cout << " file path: " << cc->file_path() << endl;
cout << " num values: " << cc->num_values() << endl;
cout << " type: " << cc->type() << endl;
cout << " data page offset: " << std::dec << cc->data_page_offset() << endl;
cout << " has dictionary page: " << cc->has_dictionary_page() << endl;
cout << " compression: " << cc->compression() << endl;
if (cc->has_dictionary_page())
cout << " dictionary page offset: " << cc->dictionary_page_offset() << endl;
cout << " has index page: " << cc->has_index_page() << endl;
}
}
cout << "schema:" << endl;
const parquet::SchemaDescriptor* p = r.schema();
cout << " name: " << p->name() << endl;
cout << " num-columns: " << p->num_columns() << endl;
std::vector<const parquet::ColumnDescriptor*> column_types;
column_types.reserve(p->num_columns());
for (int i = 0; i < p->num_columns(); ++i)
{
cout << "column " << i << ":" << endl;
const parquet::ColumnDescriptor* col_desc = p->Column(i);
column_types.push_back(col_desc);
cout << " name: " << col_desc->name() << endl;
cout << " physical type: " << col_desc->physical_type() << endl;
cout << " converted type: " << col_desc->converted_type() << endl;
cout << " type length: " << col_desc->type_length() << endl;
}
parquet::StreamReader stream{std::move(file_reader)};
if (stream.eof())
return EXIT_SUCCESS;
cout << "row values:" << endl;
// print column labels
for (const parquet::ColumnDescriptor* p : column_types)
cout << p->name() << ' ';
cout << endl;
for (int i = 0; i < r.num_rows(); ++i)
{
for (const parquet::ColumnDescriptor* p : column_types)
{
switch (p->physical_type())
{
case parquet::Type::BYTE_ARRAY:
{
switch (p->converted_type())
{
case parquet::ConvertedType::UTF8:
{
std::string v;
stream >> v;
cout << v << ' ';
break;
}
default:
throw std::runtime_error("WIP: unhandled converted type for BYTE_ARRAY");
}
break;
}
case parquet::Type::INT64:
{
switch (p->converted_type())
{
case parquet::ConvertedType::NONE:
{
int64_t v;
stream >> v;
cout << v << ' ';
break;
}
default:
throw std::runtime_error("WIP: unhandled converted type for INT64");
}
break;
}
case parquet::Type::BOOLEAN:
{
if (p->converted_type() != parquet::ConvertedType::NONE)
throw std::runtime_error("WIP: unhandled covnerted type for BOOLEAN");
bool v;
stream >> v;
cout << v << ' ';
break;
}
default:
{
std::ostringstream os;
os << "WIP: not handled type: physical=" << p->physical_type() << "; converted=" << p->converted_type();
throw std::runtime_error(os.str());
}
}
}
stream >> parquet::EndRow;
cout << endl;
}
return EXIT_SUCCESS;
}
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