AntoinePrv opened a new pull request, #50217:
URL: https://github.com/apache/arrow/pull/50217
### Rationale for this change
Add a `RleBitPackedToBitmapDecoder` capable of decoding a Parquet mixed Rle
/ BitPacked byte stream directly into a bitmap. This is an optimization to be
used when target and source bit_width = 1 that will improve decoding nullable
columns ina follow-up PR.
### What changes are included in this PR?
New classes, that reuse previous Runs and parser.
Their API is slighly different from the existing one as it fits a
partilcular case.
- `RleRunToBitmapDecoder`
- `BitPackedRunToBitmapDecoder`
- `RleRunToBitmapDecoder`
### Are these changes tested?
Yes.
### Are there any user-facing changes?
No.
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