juntaozhang opened a new issue, #8573: URL: https://github.com/apache/paimon/issues/8573
### Search before asking - [x] I searched in the [issues](https://github.com/apache/paimon/issues) and found nothing similar. ### Motivation Currently, chain tables support merge-on-read across snapshot and delta branches, but they do not support deletion vectors. For workloads that use `deletion-vectors.enabled=true` to speed up point deletes and updates, users cannot benefit from chain tables. ### Solution 1. ChainSplit: carry deletion files from both branches alongside data files. 2. ChainGroupReadTable: collect deletion files per data file when constructing ChainSplit. 3. MergeFileSplitRead: - In createChainReader, unwrap LookupMergeFunction.Factory so cross-branch records are merged by the inner merge function (e.g., DeduplicateMergeFunction) using the sequence field. ### Anything else? _No response_ ### Are you willing to submit a PR? - [x] I'm willing to submit a PR! -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
