Userwhite opened a new pull request, #66889:
URL: https://github.com/apache/doris/pull/66889
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
Incremental View Maintenance (IVM) needs a stable per-row identity for every
row in the base table. For MOW/unique tables this can be derived from the
unique key, but a detail (DUP_KEYS) table has no stable unique key — two rows
can be byte-identical, and the commit TSO alone is not row-unique within one
commit.
Row Binlog already allocates a monotonic LSN per row so that binlog rows can
be ordered/deduplicated. This PR surfaces that same LSN as a first-class hidden
column on the DUP base table, and makes Stream return the LSN alongside the
existing sequence (TSO) column, so IVM has a stable (TSO, LSN) identity for
every base row.
Scope (intentional):
- Only the DUP base index with row-binlog enabled gets the base
__DORIS_ROW_LSN_COL__ column.
- MOW does not expose or store a base LSN column (a MOW row already has a
stable unique key; adding an aggregated per-row LSN there is meaningless and
would complicate merge semantics). MOW still uses the LSN internally for the
row-binlog side-channel.
- Rollup / MV indexes are not covered; only the base index stores the row
LSN.
Design overview：
<img width="2860" height="2480" alt="image"
src="https://github.com/user-attachments/assets/889af47f-a495-441c-8d47-29eb23fcb0e9";
/>
### 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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