sollhui opened a new pull request, #63508:
URL: https://github.com/apache/doris/pull/63508
### What problem does this PR solve?
Problem Summary:
PR #58476 reuses `TabletColumn` and `TabletIndex` objects in the load path,
but each load writer can still build and hold its own `TabletSchema` object.
For wide tables with many tablets or buckets, duplicated schema-level metadata,
vectors, and lookup maps still consume noticeable memory.
This PR adds a BE-level cache for fully built load `TabletSchema` objects.
`BaseRowsetBuilder` and `DeltaWriterV2` reuse cached schemas after all
load-specific schema fields are set.
The cache key includes the serialized schema plus fields that are not part
of `TabletSchemaPB`, such as `table_id`, `db_id`, and `auto_increment_column`,
to avoid sharing a schema object across incompatible load contexts.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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