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(parent: 252e652) | patch

Support frontend-backend protocol communication using a shm_mq.

Support frontend-backend protocol communication using a shm_mq.

A background worker can use pq_redirect_to_shm_mq() to direct protocol
that would normally be sent to the frontend to a shm_mq so that another
process may read them.

The receiving process may use pq_parse_errornotice() to parse an
ErrorResponse or NoticeResponse from the background worker and, if
it wishes, ThrowErrorData() to propagate the error (with or without
further modification).

Patch by me. Review by Andres Freund.

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