XiaoHongbo-Hope opened a new pull request, #9789:
URL: https://github.com/apache/paimon/pull/9789
## Purpose
Support literal-key projection for top-level `MAP<STRING, ...>` columns
through the existing `with_projection()` API:
```python
read_builder.with_projection([
"step_id",
"content_refs.media.camera_head_left",
])
```
The suffix after the MAP column is one literal key, including any dots.
## Behavior
- Shared-shredding files read only field mapping, candidate physical
columns, and overflow when required.
- Default and legacy MAP files fall back to reading the complete MAP.
- Parquet, ORC, column rename, value type evolution, and data-evolution
reads are supported.
- Full-MAP projection and MAP aggregation retain the existing full-read
behavior.
- No new public API or table option is introduced.
## Tests
- 24 targeted Python tests pass.
- Java-written shared-shredding Parquet and ORC fixtures pass Python
selected-key reads.
- Python flake8 and `git diff --check` pass.
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