lucasfang opened a new pull request, #68:
URL: https://github.com/apache/paimon-cpp/pull/68
### Purpose
Linked issue: No linked issue
This change adds simple statistics support under `src/paimon/core/stats`.
Included changes:
- Simple stats model:
- Adds `SimpleStats` for field-level statistics including null count, min
value, and max value.
- Adds serialization, deserialization, equality, hash, and string
conversion helpers.
- Simple stats collection and conversion:
- Adds `SimpleStatsCollector` for collecting statistics from Arrow arrays
and Paimon rows.
- Adds `SimpleStatsConverter` for converting between simple stats and
column stats representations.
- Simple stats schema evolution:
- Adds `SimpleStatsEvolution` and `SimpleStatsEvolutions` helpers for
adapting statistics across schema changes.
- Supports field mapping, projected rows, and type casting for evolved
statistics.
- Test coverage:
- Adds unit tests for simple stats, stats collection, and stats evolution
behavior.
### Tests
Not run.
Test coverage included in this change:
- `src/paimon/core/stats/simple_stats_test.cpp`
- `src/paimon/core/stats/simple_stats_collector_test.cpp`
- `src/paimon/core/stats/simple_stats_evolution_test.cpp`
### API and Format
No public API, storage format, or protocol changes.
This change adds internal core stats headers and implementations under
`src/paimon/core/stats`.
### Documentation
No documentation changes required.
### Generative AI tooling
Migrate-by: Aone Copilot (GPT5.5)
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