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dblink_is_busy -- checks if connection is
busy with an async query
dblink_is_busy(text connname) returns int
dblink_is_busy tests whether an
async query is in progress.
Name of the connection to check.
Returns 1 if connection is busy, 0 if it is not busy. If this
function returns 0, it is guaranteed that
dblink_get_result will not block.