Do not print compression level in schema printer

The compression level is only used during compression, not
decompression, and isn't actually stored in the metadata. Printing it is
misleading.

parquet/src/basic.rs

@@ -358,6 +358,14 @@ pub enum Compression {
  LZ4_RAW,
 }
 
+impl Compression {
+ /// Returns the codec type of this compression setting as a string, without the compression
+ /// level.
+ pub(crate) fn codec_to_string(self) -> String {
+ format!("{:?}", self).split('(').next().unwrap().to_owned()
+ }
+}
+
 fn split_compression_string(str_setting: &str) -> Result<(&str, Option<u32>), ParquetError> {
  let split_setting = str_setting.split_once('(');
 

parquet/src/schema/printer.rs

@@ -130,7 +130,11 @@ fn print_column_chunk_metadata(out: &mut dyn io::Write, cc_metadata: &ColumnChun
  writeln!(out, "file path: {file_path_str}");
  writeln!(out, "file offset: {}", cc_metadata.file_offset());
  writeln!(out, "num of values: {}", cc_metadata.num_values());
- writeln!(out, "compression: {}", cc_metadata.compression());
+ writeln!(
+ out,
+ "compression: {}",
+ cc_metadata.compression().codec_to_string()
+ );
  writeln!(
  out,
  "total compressed size (in bytes): {}",