Jefffrey opened a new issue, #19450:
URL: https://github.com/apache/datafusion/issues/19450
### Describe the bug
Occasionally see this on CI:
```
---- cases::serialize::tests::serialize_simple_select stdout ----
Error: NotImplemented("Substrait plan with more than 1 relation trees not
supported. Number of relation trees: 0")
failures:
cases::serialize::tests::serialize_simple_select
test result: FAILED. 176 passed; 1 failed; 7 ignored; 0 measured; 0 filtered
out; finished in 0.95s
```
Example:
https://github.com/apache/datafusion/actions/runs/20425233910/job/58684165448?pr=19449
### To Reproduce
_No response_
### Expected behavior
Fix flaky test
### Additional context
_No response_
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