roachtest: costfuzz/seed-multi-region failed

roachtest.costfuzz/seed-multi-region [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyGcePrivateBazel/21520406?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyGcePrivateBazel/21520406?buildTab=artifacts#/costfuzz/seed-multi-region) on master @ [5d7eb2e1fee29048322d2533eccd0362ba67c0a8](https://github.com/cockroachdb/cockroach/commits/5d7eb2e1fee29048322d2533eccd0362ba67c0a8):

Failed with:

```
(query_comparison_util.go:501).runOneRoundQueryComparison: internal error while running perturbed statement. 447 statements run: pq: internal error: unhandled op distribute
test artifacts and logs in: /artifacts/costfuzz/seed-multi-region/run_1
```
Cluster Node to Ip Mapping:
| Node | Public IP | Private IP |
| --- | --- | --- |
| teamcity-21520406-1789624655-60-n9cpu4-geo-0001 | | 10.91.97.111 |
| teamcity-21520406-1789624655-60-n9cpu4-geo-0002 | | 10.91.128.62 |
| teamcity-21520406-1789624655-60-n9cpu4-geo-0003 | | 10.91.48.13 |
| teamcity-21520406-1789624655-60-n9cpu4-geo-0004 | | 10.91.97.222 |
| teamcity-21520406-1789624655-60-n9cpu4-geo-0005 | | 10.91.128.27 |
| teamcity-21520406-1789624655-60-n9cpu4-geo-0006 | | 10.91.48.7 |
| teamcity-21520406-1789624655-60-n9cpu4-geo-0007 | | 10.91.96.117 |
| teamcity-21520406-1789624655-60-n9cpu4-geo-0008 | | 10.91.128.12 |
| teamcity-21520406-1789624655-60-n9cpu4-geo-0009 | | 10.91.48.12 |

Parameters:
- arch=amd64
- cloud=gce
- coverageBuild=false
- cpu=4
- diskCount=0
- encrypted=false
- fs=ext4
- localSSD=true
- metamorphicDRPC=true
- metamorphicLeases=expiration
- metamorphicWriteBuffering=true
- 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-21520406/costfuzz-seed-multi-region/1789642355749/1789645070608)

See: [Datadog Logs](https://us5.datadoghq.com/logs?query=service%3Aroachtest+%40cluster%3Ateamcity-21520406-1789624655-60-n9cpu4-geo&from_ts=1789642355749&to_ts=1789645070608&live=false&storage=flex_tier)

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

Jira issue: CRDB-68471

Start with pkg/sql/opt/exec/expr/query_comparison_util.go at line 501 and inspect the artifacts and logs under /artifacts/costfuzz/seed-multi-region/run_1. Read the roachtest README and the linked investigation guide before attempting to reproduce the nine-node multi-region failure. Done means the cause of the unhandled distribute error is identified and the costfuzz run no longer fails for this case.

Written by the indexing model from the issue text.