cshuo opened a new pull request, #18716:
URL: https://github.com/apache/hudi/pull/18716
### Describe the issue this Pull Request addresses
Flink Source V2 builds its `FileIndex` from `HoodieScanContext`, but the
scan context did not carry the partition-to-bucket lookup needed by bucket
index pruning. As a result, bucket pruning information produced during filter
pushdown in `HoodieTableSource` could not be applied when Source V2 created
batch splits.
### Summary and Changelog
- Added `partitionBucketIdFunc` to `HoodieScanContext` so Source V2 scan
planning can carry bucket pruning state.
### Impact
* Enables bucket pruning for Flink Source V2 batch split generation when
reading bucket-index tables.
### 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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