QuakeWang opened a new pull request, #354:
URL: https://github.com/apache/paimon-rust/pull/354
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### Purpose
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Linked issue: #258
Rust reader already had coverage for Java/Spark-generated full type boundary
values, but schema evolution compatibility across mixed data file formats was
not explicitly covered. In particular, existing fixtures did not verify that
Parquet/ORC/Avro files written under different schema versions are read
consistently by field id, with null-fill for added columns and casts for
promoted types.
<!-- What is the purpose of the change -->
### Brief change log
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they address the issue -->
- Add `format_schema_evolution_add_column` Spark fixture with Parquet
old-schema files and ORC/Avro new-schema files.
- Add `format_schema_evolution_type_promotion` Spark fixture with Parquet
INT files and ORC/Avro BIGINT files.
- Add Rust integration tests that assert:
- planned files include Parquet, ORC, and Avro
- planned files include multiple schema ids
- reader output preserves null-fill and INT to BIGINT cast semantics
### Tests
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- `cargo test -p paimon-integration-tests test_read_format_schema_evolution
-- --nocapture`
### API and Format
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### Documentation
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