According to http://www.postgresql.org/docs/9.2/static/libpq-async.html "Even when PQresultStatus indicates a fatal error, PQgetResult should be called until it returns a null pointer, to allow libpq to process the error information completely." In libpq/fe-exec.c:PQexecFinish() error messages merges if more than one error retrieved from the backend. Can you please explain, in what cases the backend returns multiple error reports, and is it guaranteed that all of them with the same SQLSTATE code? If it is, I would also like to know, what a reason for sending the same error in multiple error reports?
-- // Dmitriy.
