basalt-26.3.2-rc-20260913: sql/row: TestRowFetcherMemoryLimits failed [OOM]

sql/row.TestRowFetcherMemoryLimits [failed](https://mesolite.cluster.engflow.com/invocations/default/f9fa1f2b-bb9a-4046-8a3d-b7df01d8103c?testReportRun=1&testReportShard=1&testReportAttempt=1#targets-Ly9wa2cvc3FsL3Jvdzpyb3dfdGVzdA==) on basalt-26.3.2-rc-20260913 @ [c6a822fb5ec0b622c713fccacb82159d1b60bbcd](https://github.com/cockroachdb/cockroach/commits/c6a822fb5ec0b622c713fccacb82159d1b60bbcd):

```
=== RUN TestRowFetcherMemoryLimits
test_log_scope.go:172: test logs captured to: outputs.zip/logTestRowFetcherMemoryLimits165635013
test_log_scope.go:82: use -show-logs to present logs inline
test_server_shim.go:168: automatically injected a shared process virtual cluster under test; see comment at top of test_server_shim.go for details.
test_server_shim.go:639: DRPC is enabled (via testserver factory defaults)
```

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)

Same failure on other branches

- #174914 basalt-26.3.2-rc-20260908: sql/row: TestRowFetcherMemoryLimits failed [C-test-failure O-robot T-sql-queries branch-basalt-26.3.2-rc-20260908]
- #174871 basalt-26.3: sql/row: TestRowFetcherMemoryLimits failed [OOM] [C-test-failure O-robot T-sql-queries branch-basalt-26.3]
- #174861 sql/row: TestRowFetcherMemoryLimits failed [OOM] [C-test-failure O-robot T-sql-queries branch-master]
- #173436 sql/row: TestRowFetcherMemoryLimits failed [C-test-failure O-robot T-sql-queries branch-master]

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

Start with sql/row.TestRowFetcherMemoryLimits and reproduce it with the race-enabled parameters from the report. Inspect the linked test invocation and captured logs, then compare the repeated failures in issues #174914, #174871, and #174861. Done means the test no longer fails with OOM and the underlying regression is addressed.

Written by the indexing model from the issue text.