de3de0afd7
Add an optional "expected" argument to override the default assumption that we're waiting for the query to return "t". This allows replacing a handwritten polling loop in recovery/t/007_sync_rep.pl with use of poll_query_until(); AFAICS that's the only remaining ad-hoc polling loop in our TAP tests. Change poll_query_until() to probe ten times per second not once per second. Like some similar changes I've been making recently, the one-second interval seems to be rooted in ancient traditions rather than the actual likely wait duration on modern machines. I'd consider reducing it further if there were a convenient way to spawn just one psql for the whole loop rather than one per probe attempt. Discussion: https://postgr.es/m/12486.1498938782@sss.pgh.pa.us
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