cshuo opened a new pull request, #18706:
URL: https://github.com/apache/hudi/pull/18706
### Describe the issue this Pull Request addresses
Flink Source V2 did not propagate the pushed-down `ColumnStatsProbe` into
its `FileIndex`, so column stats based data skipping was not applied on the
Source V2 path even when filter pushdown and data skipping were enabled.
This PR wires the existing column stats pruning context through Source V2 so
it can use the same `FileStatsIndex` pruning path already available to the file
index.
### Summary and Changelog
- Added `ColumnStatsProbe` to `HoodieScanContext`.
- Passed `columnStatsProbe` from `HoodieTableSource` into the Source V2 scan
context.
- Passed the scan context's `ColumnStatsProbe` into `FileIndex` from
`HoodieSource.buildFileIndex()`.
- Updated `TestHoodieSource` coverage to validate Source V2 split pruning
with partition stats and column stats paths.
### Impact
- Enables Source V2 to use existing column stats based file-level pruning
when data skipping and metadata column stats are enabled.
### Risk Level
low
<!-- Accepted values: none, low, medium or high. Other than `none`, explain
the risk.
If medium or high, explain what verification was done to mitigate the
risks. -->
### Documentation Update
<!-- Describe any necessary documentation update if there is any new
feature, config, or user-facing change. If not, put "none".
- The config description must be updated if new configs are added or the
default value of the configs are changed.
- Any new feature or user-facing change requires updating the Hudi website.
Please follow the
[instruction](https://hudi.apache.org/contribute/developer-setup#website)
to make changes to the website. -->
### 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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