leaves12138 opened a new pull request, #9095:
URL: https://github.com/apache/paimon/pull/9095
## What changed
- Add a reusable `BinaryIndexManifestEntry` view for index manifest records.
- Add `BinaryIndexManifestReader` to read only kind, partition, bucket,
index type, and the global-index fields needed by planning.
- Expose schema field-name constants instead of duplicating on-disk field
names in projections.
- Add focused coverage for projected field values, ADD/DELETE records,
absent global-index metadata, and iterator reuse/clearing.
## Why
Memory-sensitive planning only needs a small subset of each index manifest
entry. The existing reader materializes complete `IndexManifestEntry` and
`IndexFileMeta` object graphs, including fields that these planning paths never
consume. A projected binary scan avoids those objects and reuses one mutable
entry view across the iterator.
## Impact
Existing index manifest serialization and readers are unchanged. The new API
is opt-in and keeps the existing on-disk schema intact.
## Validation
```text
mvn -pl paimon-core -am -DskipITs -Dfast \
-Dtest=BinaryIndexManifestReaderTest,IndexManifestEntrySerializerTest \
-Dsurefire.failIfNoSpecifiedTests=false test
```
Result: 5 tests passed. Spotless and Checkstyle passed as part of the Maven
build.
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