Re: modifying in the libpg files

"Islam Hegazy" <islheg@gmail.com> writes:
> ../../src/interfaces/libpq/libpq.so: undefined reference to =
> `PrintQueryResults'

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