I don't understand in what sense PQgetResult is asynchronous. Obviously
PQsendQuery returns immediately and apparently PQgetResult() allows me
to get separate results from multiple queries submitted together, but...
Let's say I have a table with 1,000,000 rows and I PQsendQuery() a query
to get them all. When I call PQgetResult() the first time, will it
block until all 1,000,000 are ready, or will it send back everything
that's ready at the time I call it?
If the latter, is pgtcl's pg_getresult supposed to work the same way?