felipepessoto commented on PR #12445:
URL: https://github.com/apache/gluten/pull/12445#issuecomment-4895387729
## ✅ CI validation: the tests fail without the fix, for the expected reason
This draft intentionally contains **only the test suite, without the fix**.
The `spark-test-spark40` and `spark-test-spark41` jobs failed exactly as
intended — confirming `GlutenDeltaVariantWriteSuite` is an effective regression
guard.
All three tests fail on unpatched `main`, each with the identical root cause
the fix targets:
```
org.apache.spark.SparkException: Job aborted due to stage failure:
java.lang.UnsupportedOperationException: Unsupported data type: variant
at
org.apache.spark.sql.utils.SparkArrowUtil$.toArrowType(SparkArrowUtil.scala:60)
at
org.apache.spark.sql.utils.SparkArrowUtil$.toArrowField(SparkArrowUtil.scala:137)
at
org.apache.spark.sql.utils.SparkArrowUtil$.$anonfun$toArrowSchema$1(SparkArrowUtil.scala:167)
... (RowToVeloxColumnarExec — the offloaded native Delta write path)
```
| Workflow | Job | Suite result |
| --- | --- | --- |
| Velox Backend (x86) |
[`spark-test-spark40`](https://github.com/apache/gluten/actions/runs/28719620215/job/85167199671)
| ❌ 3/3 tests failed (variant) |
| Velox Backend (x86) |
[`spark-test-spark41`](https://github.com/apache/gluten/actions/runs/28719620215/job/85167199696)
| ❌ 3/3 tests failed (variant) |
| Velox Backend (Enhanced) |
[`spark-test-spark40`](https://github.com/apache/gluten/actions/runs/28719620194/job/85167301731)
| ❌ 3/3 tests failed (variant) |
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