[8.x] ESQL: Fix EsqlNodeSubclassTest failure from mutating (#125503) #125513
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We shouldn't mutate LogicalPlan.child().output() (or just LogicalPlan.output()); we did so in RENAME, but only in EsqlNodeSubclassTest, making them flaky. >The PR at elastic#122250 seems to have created a flaky test failure in `EsqlNodeSubclassTests`. Local runs with `-Dtests.iters=100` lead to about two dozen failures in over 70k tests run. This is not a high failure rate, but still requires addressing. > >The single line added to the Analyzer by that PR causes an `UnsupportedOperationException` on attempting to mutate an immutable collection when running `EsqlNodeSubclassTests`. It turns out that this code path comes from `Rename.output()` which is only called in test scenarios. So a quick fix is to copy the child output into a mutable collection.
alex-spies
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:Analytics/ES|QL
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Backports the following commits to 8.x: