Part of #2008. Letters (A, B0–B7, C, D, E) are the PRs listed there; this is E.
Scope
- Merge-on-read:
WrapPositionDeleteFilter implemented on the hidden row-ordinal column; position deletes applied while scanning, equality deletes after.
DELETE and UPDATE: rows identified by (file, position) through the scan, written as position delete files; UPDATE is delete plus insert through C's writer; one snapshot per statement.- A commit that loses the race is retried or fails with a serialization error, never silently dropped.
VACUUM stays the current no-op; compaction and snapshot expiry are a follow-up issue.
Out of scope
Copy-on-write, partition evolution, branches and tags (#1683 §2.3).
Depends on
C, D.
Acceptance
- Deletes made in Cloudberry are seen by Spark and the reverse.
UPDATE/DELETE counts match; a rolled-back statement changes nothing visible.- Two concurrent transactions on one table: one commits, the other fails or retries; no lost update.
- A scan over many small delete files stays within the tracked memory budget.
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Part of #2008. Letters (A, B0–B7, C, D, E) are the PRs listed there; this is E.
Scope
WrapPositionDeleteFilterimplemented on the hidden row-ordinal column; position deletes applied while scanning, equality deletes after.DELETEandUPDATE: rows identified by (file, position) through the scan, written as position delete files;UPDATEis delete plus insert through C's writer; one snapshot per statement.VACUUMstays the current no-op; compaction and snapshot expiry are a follow-up issue.Out of scope
Copy-on-write, partition evolution, branches and tags (#1683 §2.3).
Depends on
C, D.
Acceptance
UPDATE/DELETEcounts match; a rolled-back statement changes nothing visible.