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Implement PostgreSQL's COPY ... FROM STDIN protocol for bulk data loading. The pull-based CopyInReceiver interface gives callers O(1) bounded memory: the session calls pg_copy_ready after each send_copy_data, so the client controls data flow. Session API: copy_in(sql, receiver), send_copy_data(data), finish_copy(), abort_copy(reason). CopyInReceiver callbacks: pg_copy_ready, pg_copy_complete, pg_copy_failed. The COPY query is sent via the simple query protocol. The server responds with CopyInResponse, then the client streams CopyData messages, finishing with CopyDone (success) or CopyFail (abort). The server responds with CommandComplete + ReadyForQuery on success, or ErrorResponse + ReadyForQuery on failure. New query state _CopyInInFlight manages the lifecycle. Data-stream methods (send_copy_data, finish_copy, abort_copy) use direct type matching on query_state (following the cancel pattern) rather than going through the _QueryState interface, since they are only valid during an active COPY. Design: #104
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Hi @SeanTAllen, The changelog - added label was added to this pull request; all PRs with a changelog label need to have release notes included as part of the PR. If you haven't added release notes already, please do. Release notes are added by creating a uniquely named file in the The basic format of the release notes (using markdown) should be: Thanks. |
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Add PostgreSQL's
COPY ... FROM STDINprotocol for bulk data loading with a pull-basedCopyInReceiverinterface that provides O(1) bounded memory flow control.Session API:
copy_in(),send_copy_data(),finish_copy(),abort_copy(). The session callspg_copy_readyafter eachsend_copy_data, letting the client control data flow. On completion:pg_copy_complete(count). On failure:pg_copy_failedwithErrorResponseMessageorClientQueryError.New
_CopyInInFlightquery state manages the lifecycle. Data-stream methods use direct type matching onquery_state(following the cancel pattern) since they're only valid during an active COPY.Design: #104