vamsikarnika opened a new pull request, #18314:
URL: https://github.com/apache/hudi/pull/18314
### Describe the issue this Pull Request addresses
- Support bootstrapping of col stats for MOR table.
- Fix clean operation with col stats. Even though stats are nullified, the
records apparently were not deleted from the col stats partition.
### Summary and Changelog
- Support bootstrapping of col stats for MOR table.
- Fix clean operation with col stats. Even though stats are nullified, the
records apparently were not deleted from the col stats partition.
### Impact
We could enable col stats for MOR table at any given state.
Ran into other issues along the way which I had to fix to get the patch
ready.
- DirectoryInfo was not accounting for files fetched from MDT. When a new
MDT partition is initialized, to fetch file info, we poll MDT rather than doing
FS based listing. This had some a bug and had to fix it.
- When clean from data table is applied to MDT, we were nullifying the stats
or marking it as deleted, but the record as such is not deleted from col stats
partition and was lingering. Fixed the same in this patch.
Tests covered:
- bootstrapping of both COW and MOR table.
- Covered both partitioned and non-partitioned table.
- Ensure log files w/ delete block, partially failed log blocks and rollback
blocks are accounted for in tests.
- Added tests to validate clean does remove the entry from col stats for
both table types and partition and non-partitioned table.
### Risk Level
low
### Documentation Update
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### Contributor's checklist
- [ ] Read through [contributor's
guide](https://hudi.apache.org/contribute/how-to-contribute)
- [ ] Enough context is provided in the sections above
- [ ] Adequate tests were added if applicable
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