roachtest: costfuzz/rand-tables/mem=low failed

roachtest.costfuzz/rand-tables/mem=low [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyGcePrivateBazel/21518918?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyGcePrivateBazel/21518918?buildTab=artifacts#/costfuzz/rand-tables/mem=low) on master @ [17d4d0939905dacd9f19fb6a372bed8ac62a73fa](https://github.com/cockroachdb/cockroach/commits/17d4d0939905dacd9f19fb6a372bed8ac62a73fa):

Failed with:

```
(query_comparison_util.go:501).runOneRoundQueryComparison: internal error while running perturbed statement. 1335 statements run: pq: internal error: unhandled op distribute
test artifacts and logs in: /artifacts/costfuzz/rand-tables/mem=low/run_1
```
Cluster Node to Ip Mapping:
| Node | Public IP | Private IP |
| --- | --- | --- |
| teamcity-21518918-1789538360-60-n1cpu4lm-0001 | | 10.91.99.228 |

Parameters:
- arch=amd64
- cloud=gce
- coverageBuild=false
- cpu=4
- diskCount=0
- encrypted=false
- fs=ext4
- localSSD=true
- metamorphicLeases=default
- runtimeAssertionsBuild=false
Help

See: [roachtest README](https://github.com/cockroachdb/cockroach/blob/master/pkg/cmd/roachtest/README.md)

See: [How To Investigate \(internal\)](https://cockroachlabs.atlassian.net/l/c/SSSBr8c7)

See: [Grafana](https://go.crdb.dev/roachtest-grafana/teamcity-21518918/costfuzz-rand-tables-mem-low/1789550395326/1789550719938)

See: [Datadog Logs](https://us5.datadoghq.com/logs?query=service%3Aroachtest+%40cluster%3Ateamcity-21518918-1789538360-60-n1cpu4lm&from_ts=1789550395326&to_ts=1789550719938&live=false&storage=flex_tier)

[Improve this report!](https://github.com/cockroachdb/cockroach/tree/master/pkg/cmd/bazci/githubpost/issues)

Jira issue: CRDB-68449

Start with query_comparison_util.go at line 501 and the failed costfuzz/rand-tables/mem=low artifacts and logs from the linked roachtest run. Use the roachtest README for investigation guidance; done means the unhandled distribute error is understood and the costfuzz test completes successfully.

Written by the indexing model from the issue text.