Is PME format supported? #1759

I don't think PME is supported on the native Parquet path yet — at least, that's what I'm seeing in the code as of 2026年07月03日:

• The native scan seems to hardcode decryption off — file_decryption_properties: None in native-engine/datafusion-ext-plans/src/parquet_exec.rs.
• I couldn't find a path that passes keys from Spark down to native — no key/crypto fields in the ParquetScanExecNode / FileScanExecConf proto, and nothing on the Scala side reading parquet.encryption.* or a KMS crypto.factory.
• The write path looks like it explicitly rejects it — assert(!encryptEnabled, "not supported writing encrypted table") in NativeParquetInsertIntoHiveTableBase.scala.

As for why your patch might still error: the "encrypted footer but decryption properties were not provided" message seems to come from footer/metadata parsing, which runs before any column decryption. Auron overrides AsyncFileReader::get_metadata with its own reader (parquet_exec.rs:399), and that override takes ArrowReaderOptions as an unused _options argument and reads the footer via the deprecated fetch_parquet_metadata, which as far as I can tell has no decryption path — so the properties you set on the ParquetOpener may not be reaching the footer parser, even though the field is populated. I could be missing something, though. If you wanted to take this further, a GitHub issue might be a good place to scope it.