voonhous opened a new pull request, #18036:
URL: https://github.com/apache/hudi/pull/18036
### Describe the issue this Pull Request addresses
<!-- Either describe the issue inline here with motivation behind the
changes
(or) link to an issue by including `Closes #<issue-number>` for
context.
If this PR includes changes to the storage format, public APIs,
or has breaking changes, use `!` (e.g., feat!: ...) -->
Adds read and write support for Spark `Variant` data types in Hudi. Since
`Variant` is exclusive to Spark 4.0+, this PR introduces an adapter pattern to
handle schema conversion differences, ensuring backward compatibility with
Spark 3.x while enabling semi-structured data support in Spark 4.x.
Note1: Please merge this PR first: https://github.com/apache/hudi/pull/17833
Note2:
This PR is purely to add support for writing shredded variants.
There is no end-2-end flow to allow users to enable shredded variant writes
as of now. We will address this in a separate PR to make PRs small and
manageable for reviews.
The next PR for this will be to add a parquet-config to allow users to
enable/disable shredding and also to force shredding on certain columns for
testing.
### Summary and Changelog
<!-- Short, plain-English summary of what users gain or what changed in
behavior.
Followed by a detailed log of all the changes. Highlight if any code
was copied. -->
This PR refactors schema converters behind `SparkAdapter` to handle
version-specific data types.
Updated `HoodieRowParquetWriteSupport` to allow support for writing shredded
variants.
### Impact
<!-- Describe any public API or user-facing feature change or any
performance impact. -->
* **New Feature:** Users on Spark 4.0 can write `Variant` shredded columns.
* **Compatibility:** Zero impact on Spark 3.x flows (methods default to
current behavior).
### Risk Level
<!-- 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. -->
**Low**
### 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. -->
None
### Contributor's checklist
- [X] Read through [contributor's
guide](https://hudi.apache.org/contribute/how-to-contribute)
- [X] Enough context is provided in the sections above
- [X] Adequate tests were added if applicable
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