Add helper function parquet::ParquetVersionToString and use it in parquet-reader tool

cpp/src/parquet/metadata.cc

@@ -47,6 +47,17 @@ const ApplicationVersion& ApplicationVersion::PARQUET_CPP_FIXED_STATS_VERSION()
   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";
+    default:
+      return "UNKNOWN";
+  }
+}
+
 template <typename DType>
 static std::shared_ptr<RowGroupStatistics> MakeTypedColumnStats(
     const format::ColumnMetaData& metadata, const ColumnDescriptor* descr) {

cpp/src/parquet/metadata.h

@@ -282,6 +282,8 @@ class PARQUET_EXPORT FileMetaDataBuilder {
   std::unique_ptr<FileMetaDataBuilderImpl> impl_;
 };
 
+PARQUET_EXPORT std::string ParquetVersionToString(ParquetVersion::type ver);
+
 }  // namespace parquet
 
 #endif  // PARQUET_FILE_METADATA_H

cpp/src/parquet/printer.cc

@@ -38,7 +38,7 @@ void ParquetFilePrinter::DebugPrint(std::ostream& stream, std::list<int> selecte
   const FileMetaData* file_metadata = fileReader->metadata().get();
 
   stream << "File Name: " << filename << "\n";
-  stream << "Version: " << file_metadata->version() << "\n";
+  stream << "Version: " << ParquetVersionToString(file_metadata->version()) << "\n";
   stream << "Created By: " << file_metadata->created_by() << "\n";
   stream << "Total rows: " << file_metadata->num_rows() << "\n";
 

cpp/tools/parquet/parquet-reader.cc

@@ -23,7 +23,7 @@
 
 int main(int argc, char** argv) {
   if (argc > 5 || argc < 2) {
-    std::cerr << "Usage: parquet_reader [--only-metadata] [--no-memory-map] [--json]"
+    std::cerr << "Usage: parquet-reader [--only-metadata] [--no-memory-map] [--json]"
                  "[--print-key-value-metadata] [--columns=...] <file>"
               << std::endl;
     return -1;