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GH-41840: [Python][FlightRPC] Add experimental capability negotiation example - #51699
shatrughnaupadhyay wants to merge 1 commit into
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This opt-in Python DoAction example negotiates shared feature versions and upper bounds before an application enables a Flight feature. It validates bounded JSON requests and replies, rejects missing required features and permits optional fallback only when the initial call returns UNIMPLEMENTED. Caller authentication headers and deadlines are forwarded.
This is an experimental example related to #41840 and #34485. It defines no standard action or protocol identifiers, activates no transfer feature and does not bind the result to a later RPC. Agreement on its scope and relationship to Flight SQL GetSqlInfo is pending. It does not resolve either issue.
Validation: 74 tests passed with Python 3.12.12 and the PyArrow 25.0.1 wheel, including localhost negotiation, authentication, invalid replies and error propagation. Flake8, autopep8 and whitespace checks passed. Source-built Arrow and upstream CI have not been verified.
Draft: human author review is pending. The author must review, understand and own the changes before marking this ready.