basalt-26.3: sql/schemachange: TestColumnConversions failed

sql/schemachange.TestColumnConversions [failed](https://mesolite.cluster.engflow.com/invocations/default/d239d62a-5965-4976-9f91-d90c819f20c9?testReportRun=3&testReportShard=1&testReportAttempt=1#targets-Ly9wa2cvc3FsL3NjaGVtYWNoYW5nZTpzY2hlbWFjaGFuZ2VfdGVzdA==) on basalt-26.3 @ [017b84cd0101b832a6ee0c1934d073d108d0b24a](https://github.com/cockroachdb/cockroach/commits/017b84cd0101b832a6ee0c1934d073d108d0b24a):

```
pkg/sql/internal.go:1997 +0xd5
github.com/cockroachdb/cockroach/pkg/sql/rowexec.(*sampleAggregator).mainLoop.func1(0x3f800000)
pkg/sql/rowexec/sample_aggregator.go:258 +0x1df
github.com/cockroachdb/cockroach/pkg/sql/rowexec.(*sampleAggregator).mainLoop(0xc02bdeb108, {0xa367b78, 0xc018a5a780}, {0xa331a28, 0xc003faed88})
pkg/sql/rowexec/sample_aggregator.go:373 +0x1295
github.com/cockroachdb/cockroach/pkg/sql/rowexec.(*sampleAggregator).Run(0xc02bdeb108, {0xa367b78, 0xc018a5a780}, {0xa331a28, 0xc003faed88})
pkg/sql/rowexec/sample_aggregator.go:215 +0x236
github.com/cockroachdb/cockroach/pkg/sql/flowinfra.(*FlowBase).Run(0xc001334f08, {0xa367b78, 0xc018a5a780}, 0x0)
pkg/sql/flowinfra/flow.go:593 +0x767
github.com/cockroachdb/cockroach/pkg/sql.(*DistSQLPlanner).Run(0xc01595a9a0, {0xa367b78, 0xc018a5a780}, 0xc004a6edd0, 0xc01da49a40, 0xc01a3d8d00, 0xc003faed88, 0xc016806408, 0x0)
pkg/sql/distsql_running.go:1091 +0x1c56
github.com/cockroachdb/cockroach/pkg/sql.(*DistSQLPlanner).planAndRunCreateStats(_, {_, _}, _, _, _, _, _, _, {{0xc018002b28, ...}, ...}, ...)
pkg/sql/distsql_plan_stats.go:834 +0x898
github.com/cockroachdb/cockroach/pkg/sql.(*createStatsResumer).Resume.func2({0xa367bb0, 0xc01b93cd50}, {0xa3f57e8, 0xc004f626e0})
pkg/sql/create_stats.go:1115 +0x845
github.com/cockroachdb/cockroach/pkg/sql.(*InternalDB).Txn.func1({0xa367bb0, 0xc01b93cd50}, 0xc004f626e0)
pkg/sql/internal.go:1996 +0x53
github.com/cockroachdb/cockroach/pkg/sql.(*InternalDB).txn.func4({0xa367bb0, 0xc01b93cd50}, 0xc01da49a40)
pkg/sql/internal.go:2089 +0x5f6
github.com/cockroachdb/cockroach/pkg/kv.(*Txn).exec(0xc01da49a40, {0xa367bb0, 0xc01b93cd50}, 0xc016293900)
pkg/kv/txn.go:1190 +0xae
github.com/cockroachdb/cockroach/pkg/kv.runTxn({0xa367bb0, 0xc01b93cd50}, 0xc01da49a40, 0xc016293900)
pkg/kv/db.go:1169 +0x6c
github.com/cockroachdb/cockroach/pkg/kv.(*DB).TxnWithAdmissionControl(0xc001e24fd0, {0xa367bb0, 0xc01b93cd50}, 0x1, 0x9c, 0x0, 0xc016293900)
pkg/kv/db.go:1129 +0x215
github.com/cockroachdb/cockroach/pkg/sql.(*InternalDB).txn.func2({0xa367bb0, 0xc01b93cd50}, 0xc016293900)
pkg/sql/internal.go:2062 +0x6e
github.com/cockroachdb/cockroach/pkg/sql.(*InternalDB).txn(0xc014ef50e0, {0xa367bb0, 0xc01b93cd50}, 0xc028c19b90, {0xc01a8b2c38, 0x1, 0x46fe05?})
pkg/sql/internal.go:2076 +0x6d2
github.com/cockroachdb/cockroach/pkg/sql.(*InternalDB).Txn(0xc014ef50e0, {0xa367bb0, 0xc01b93cd50}, 0xc017319980, {0xc01a8b2c38, 0x1, 0x1})
pkg/sql/internal.go:1997 +0xd5
github.com/cockroachdb/cockroach/pkg/sql.(*createStatsResumer).Resume(0xc017e614b8, {0xa367bb0, 0xc01b93cd50}, {0x9b429c0, 0xc0197733f0})
pkg/sql/create_stats.go:1064 +0xac5
github.com/cockroachdb/cockroach/pkg/jobs.(*Registry).stepThroughStateMachine.func2(0xc0133dbb00, 0xc0150cf508, 0xc02a9f76e0, {0xa354130, 0xc017e614b8}, {0xa367bb0, 0xc01b93cd50}, {0x9b429c0, 0xc0197733f0})
pkg/jobs/registry.go:1691 +0x16b
github.com/cockroachdb/cockroach/pkg/jobs.(*Registry).stepThroughStateMachine(0xc0150cf508, {0xa367bb0, 0xc01b93ca80}, {0x9b429c0, 0xc0197733f0}, {0xa354130, 0xc017e614b8}, 0xc00396ec00, {0x9edbfd0, 0x7}, ...)
pkg/jobs/registry.go:1692 +0x1268
github.com/cockroachdb/cockroach/pkg/jobs.(*Registry).runJob(0xc0150cf508, {0xa367bb0, 0xc01b93ca80}, {0xa354130, 0xc017e614b8}, 0xc00396ec00, {0x9edbfd0, 0x7}, {0xc01307bc08, 0x17})
pkg/jobs/adopt.go:503 +0x82b
github.com/cockroachdb/cockroach/pkg/jobs.(*StartableJob).Start.func2({0xc01717a000?, 0xa3690e8?})
pkg/jobs/jobs.go:812 +0x265
github.com/cockroachdb/cockroach/pkg/util/stop.(*Stopper).RunAsyncTaskEx.func1({0xa3690e8, 0xc01a801680})
pkg/util/stop/stopper.go:447 +0x113
created by github.com/cockroachdb/cockroach/pkg/util/stop.(*Stopper).RunAsyncTaskEx in goroutine 240136
pkg/util/stop/stopper.go:445 +0x247
=== RUN TestColumnConversions/column_conversion_checks
test_log_scope.go:172: test logs captured to: outputs.zip/logTestColumnConversions_column_conversion_checks1444166638
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.
TestColumnConversions/column_conversion_checks (41m40s)
```

Parameters:
- attempt=1
- race=true
- run=3
- shard=1
Help

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

/cc @cockroachlabs/sql-foundations

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Jira issue: CRDB-68063