danielhumanmod opened a new pull request, #19757:
URL: https://github.com/apache/datafusion/pull/19757
## Which issue does this PR close?
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- Closes #19756.
## Rationale for this change
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The previous logic of `EnsureCooperative` optimizer lacked context awareness
regarding ancestor nodes, making it not idempotent across multiple runs.
Specifically, we need to ensure that:
1. **Idempotency**: Running the rule multiple times does not produce nested
`CooperativeExec` wrappers.
2. **Context Awareness**: If a subtree is already protected by a
`CooperativeExec`, we should skip and not double-wrap its children.
## What changes are included in this PR?
To solve this, we cannot rely solely on `transform_up` (which lacks parent
context) or `transform_down` (which makes safe mutation difficult). This PR
adopts `transform_down_up` with a depth counter to strictly enforce that nodes
are only wrapped when they are not currently under a `CooperativeExec` scope.
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## Are these changes tested?
More unit tests coverage
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## Are there any user-facing changes?
No
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