Shawn-Hx opened a new pull request, #3420:
URL: https://github.com/apache/fluss/pull/3420
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### Purpose
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Linked issue: close #3419
<!-- What is the purpose of the change -->
This PR supports reporting watermarks to Paimon snapshots during lake
tiering.
### Brief change log
<!-- Please describe the changes made in this pull request and explain how
they address the issue -->
- Introduced watermark extraction for Fluss rows in the lake tiering
pipeline.
- Added watermark propagation through lake write results and tiering commit.
- Aggregated watermarks across tiered buckets before committing to the lake.
- Reported the aggregated watermark to Paimon snapshots when committing.
- Updated serializers and tests to support nullable and negative watermark
values.
- Added coverage for watermark extraction, commit aggregation, and Paimon
snapshot watermark reporting.
### Tests
<!-- List UT and IT cases to verify this change -->
Add tests in:
- PaimonWriteResultSerializerTest
- PaimonTieringTest
- TieringCommitOperatorTest
- SimpleWatermarkExtractorTest
### API and Format
<!-- Does this change affect API or storage format -->
This change extends the lake tiering API to carry watermark information
through write results and committers.
### Documentation
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No user-facing documentation needs to be added.
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