"Islam Hegazy" <islheg(at)gmail(dot)com> writes:
> ../../src/interfaces/libpq/libpq.so: undefined reference to =
libpq.so is a shared library --- you can't have it calling functions
that are not in either itself or a shared library it depends on.
You'd have to move PrintQueryTuples bodily into libpq.so to make this
work. There are various reasons why that's not a great idea, the
main one being that libpq has no idea where psql is intending to
send the output.
IMHO a reasonable solution would involve extending libpq's published API
to allow returning partial query results. This seems like it could be
made to fit into the PQsendQuery/PQgetResult paradigm, but nobody's
actually done that yet.
regards, tom lane
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