basalt-26.3.2-rc-20260908: sql/tests: TestSplitAtTableBoundary failed

sql/tests.TestSplitAtTableBoundary [failed](https://mesolite.cluster.engflow.com/invocations/default/8e093717-3329-4dab-8a28-3ae7ce8b0293?testReportRun=1&testReportShard=16&testReportAttempt=1#targets-Ly9wa2cvc3FsL3Rlc3RzOnRlc3RzX3Rlc3Q=) on basalt-26.3.2-rc-20260908 @ [807558e5e81666af257c811e925e4cae570abc28](https://github.com/cockroachdb/cockroach/commits/807558e5e81666af257c811e925e4cae570abc28):

```
=== RUN TestSplitAtTableBoundary
test_log_scope.go:172: test logs captured to: outputs.zip/logTestSplitAtTableBoundary2908160631
test_log_scope.go:82: use -show-logs to present logs inline
table_split_test.go:53: condition failed to evaluate within 3m45s: from table_split_test.go:60: expected range start key /Table/106; got /Table/84

goroutine dump: /mnt/engflow/worker/work/0/exec/bazel-out/k8-fastbuild/testlogs/pkg/sql/tests/tests_test/shard_16_of_16_run_1_of_3/test.outputs/goroutine_dump_1404722091.txt
panic.go:694: -- test log scope end --
test logs left over in: outputs.zip/logTestSplitAtTableBoundary2908160631
--- FAIL: TestSplitAtTableBoundary (815.29s)
```

Parameters:
- attempt=1
- race=true
- run=1
- shard=16
Help

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

Same failure on other branches

- #174858 sql/tests: TestSplitAtTableBoundary failed [OOM] [C-test-failure O-robot T-sql-queries branch-master]
- #174818 release-26.3: sql/tests: TestSplitAtTableBoundary failed [C-test-failure O-robot T-sql-queries branch-release-26.3 release-blocker]
- #174815 release-26.2: sql/tests: TestSplitAtTableBoundary failed [OOM] [C-test-failure O-robot T-sql-queries branch-release-26.2 release-blocker]
- #174750 sql/tests: TestSplitAtTableBoundary failed [OOM] [C-test-failure O-robot T-sql-queries branch-master release-blocker]
- #174697 basalt-26.3: sql/tests: TestSplitAtTableBoundary failed [C-test-failure O-robot T-sql-queries branch-basalt-26.3 release-blocker]

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

Start with sql/tests/table_split_test.go, especially the failure at line 60, and reproduce TestSplitAtTableBoundary using the linked test report and captured logs. Investigate why the observed range start key is /Table/84 instead of the expected /Table/106; done means the test completes without timing out and reports the expected boundary.

Written by the indexing model from the issue text.