n0r0shi opened a new pull request, #3593:
URL: https://github.com/apache/datafusion-comet/pull/3593
# Summary
- Add Rust UDFs for Spark's char/varchar write-side validation
(`CharVarcharCodegenUtils.charTypeWriteSideCheck` /
`varcharTypeWriteSideCheck`), triggered when
inserting into `CHAR(n)` / `VARCHAR(n)` columns
- `charTypeWriteSideCheck`: pad shorter strings with spaces, trim trailing
spaces if longer, error if exceeds limit
- `varcharTypeWriteSideCheck`: pass through if within limit, trim trailing
spaces if longer, error if exceeds limit
- Wire via `StaticInvoke` handler in `statics.scala` using
`CometScalarFunction`
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