slfan1989 opened a new issue, #2459:
URL: https://github.com/apache/iceberg-go/issues/2459
### Apache Iceberg version
main (development)
### Please describe the bug 🐞
`iceberg upgrade --dry-run` reports success for unsupported target format
versions because the dry-run path returns before the upgrade transaction
validates the target.
### Steps to reproduce
1. Configure the Iceberg CLI to access a catalog with an existing Iceberg v1
table named `db.events`.
2. Run:
```sh
iceberg upgrade --dry-run db.events 999
echo $?
```
### Actual behavior
The command exits with status `0` and prints:
```text
[DRY RUN] Would upgrade db.events from format version 1 to 999.
```
The upgrade transaction rejects the same target with an `invalid format
version` error.
### Expected behavior
The dry run should validate the target format version using the same
transaction logic as the actual upgrade. An unsupported target should produce
an `invalid format version` error and exit with a non-zero status. A valid dry
run should still display the planned upgrade without committing any changes.
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