Weston Pace created ARROW-13417:
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Summary: [C++] The merged generator can sometimes pull from source
sync-reentrant
Key: ARROW-13417
URL: https://issues.apache.org/jira/browse/ARROW-13417
Project: Apache Arrow
Issue Type: Bug
Components: C++
Reporter: Weston Pace
Async generators make no promises about whether or not they are synchronously
reentrant and they should never be pulled in a synchronously reentrant fashion.
The merged generator is breaking this rule.
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