[GitHub] [arrow] nevi-me commented on pull request #8291: ARROW-8426: [Rust] [Parquet] Add support for writing dictionary types

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nevi-me commented on pull request #8291:
URL: https://github.com/apache/arrow/pull/8291#issuecomment-703011014


   Hi @carols10cents, my apologies for the delay.
   
   > Am I at least correct that adding dictionary support will involve adding support for the dictionary schema as well as the dictionary data? And that neither of those are done yet?
   
   The Parquet format's dictionary semantics are in my understanding different to Arrow, in that we could have a `StringArray` in Arrow that gets saved with Parquet's dictionary encoding. I'm still going through the rest of the Rust Parquet codebase though, so I'm not speaking from any authority.
   
   My comment was more in passing, and generally around dictionary support in IPC, in that beyond serializing an `arrow::datatypes::Schema` to `arrow::ipc::Schema`, there might be little in relation between the file formats.


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