pitrou commented on PR #47086:
URL: https://github.com/apache/arrow/pull/47086#issuecomment-3085062003
Ok, perhaps we can define an enum:
```c++
/// An abstract, codec-independent, compression level
///
/// These enum members are mapped to codec-specific
/// concrete compression levels.
enum class CompressionLevel { kFastest, kFaster, kBalanced, kBetter, kBest };
```
And switch `CodecOptions` to something like:
```c++
class ARROW_EXPORT CodecOptions {
public:
explicit CodecOptions(int compression_level = kUseDefaultCompressionLevel)
: compression_level(compression_level) {}
explicit CodecOptions(CompressionLevel compression_level)
: compression_level(compression_level) {}
virtual ~CodecOptions() = default;
/// An abstract compression level, or a codec-specific compression level
std::variant<CompressionLevel, int> compression_level;
};
```
And then have Parquet use `kBalanced` or `kBetter` by default, while IPC
would use `kFaster` by default.
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