Rich-T-kid commented on issue #8016:
URL: https://github.com/apache/arrow-rs/issues/8016#issuecomment-4444805252
@brancz looking at `parquet/src/arrow/arrow_writer/mod.rs` it looks like
dictionary arrays are written out as their non-encoded flat form
```
ArrowDataType::Dictionary(_, value_type) => match value_type.as_ref() {
ArrowDataType::Utf8 | ArrowDataType::LargeUtf8 |
ArrowDataType::Binary | ArrowDataType::LargeBinary => {
out.push(bytes(leaves.next().unwrap())?)
}
ArrowDataType::Utf8View | ArrowDataType::BinaryView => {
out.push(bytes(leaves.next().unwrap())?)
}
ArrowDataType::FixedSizeBinary(_) => {
out.push(bytes(leaves.next().unwrap())?)
}
```
wouldn't it be a good idea to support writing out dictionary arrays as
RLE_DICTIONARY in parquet?
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