Add a "row processor" API to libpq for better handling of large results.
Traditionally libpq has collected an entire query result before passing it back to the application. That provides a simple and transactional API, but it's pretty inefficient for large result sets. This patch allows the application to process each row on-the-fly instead of accumulating the rows into the PGresult. Error recovery becomes a bit more complex, but often that tradeoff is well worth making. Kyotaro Horiguchi, reviewed by Marko Kreen and Tom Lane
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