baibaichen opened a new issue, #11918:
URL: https://github.com/apache/gluten/issues/11918
## Backend
VL (Velox)
## Bug description
`CastTransformer` does not pass per-expression timezone through Substrait.
When casting timestamp to string, Velox does not use the session timezone,
producing output that differs from Spark's expected format.
This is a Substrait architecture limitation that requires changes at the C++
layer.
Affects both Spark 4.0 and 4.1.
**Parent issue**: #11550
### Impact
| Suite | Failures | spark40 | spark41 |
|-------|:--------:|:-------:|:-------:|
| GlutenToPrettyStringSuite | 1 ("Timestamp as pretty strings") | 🔴 | 🔴 |
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