basalt-26.3.2-rc-20260908: sql/row: TestNextRowPartialColumnFamily failed

sql/row.TestNextRowPartialColumnFamily [failed](https://mesolite.cluster.engflow.com/invocations/default/8e093717-3329-4dab-8a28-3ae7ce8b0293?testReportRun=1&testReportShard=1&testReportAttempt=1#targets-Ly9wa2cvc3FsL3Jvdzpyb3dfdGVzdA==) on basalt-26.3.2-rc-20260908 @ [807558e5e81666af257c811e925e4cae570abc28](https://github.com/cockroachdb/cockroach/commits/807558e5e81666af257c811e925e4cae570abc28):

```
=== RUN TestNextRowPartialColumnFamily
test_log_scope.go:172: test logs captured to: outputs.zip/logTestNextRowPartialColumnFamily430290601
test_log_scope.go:82: use -show-logs to present logs inline
test_server_shim.go:168: automatically injected an external process virtual cluster under test; see comment at top of test_server_shim.go for details.
```

Parameters:
- attempt=1
- race=true
- run=1
- shard=1
Help

See also: [How To Investigate a Go Test Failure \(internal\)](https://cockroachlabs.atlassian.net/l/c/HgfXfJgM)

[This test on roachdash](https://roachdash.crdb.dev/?filter=status:open%20t:.*TestNextRowPartialColumnFamily.*&sort=title+created&display=lastcommented+project) | [Improve this report!](https://github.com/cockroachdb/cockroach/tree/master/pkg/cmd/bazci/githubpost/issues)

Start by reproducing sql/row.TestNextRowPartialColumnFamily with race detection enabled, then inspect the linked test report and captured logs from the basalt run. Trace the failure to its cause and confirm the test passes reliably without introducing new failures.

Written by the indexing model from the issue text.