Wait for slot to become inactive before continuing.
Author: Petr Jelinek
is($stdout_recv, $expected,
'got same expected output from pg_recvlogical decoding session');
+$node_master->poll_query_until('postgres',
+"SELECT EXISTS (SELECT 1 FROM pg_replication_slots WHERE slot_name = 'test_slot' AND active_pid IS NULL)"
+)
+ or die "slot never became inactive";
+
$stdout_recv = $node_master->pg_recvlogical_upto(
'postgres', 'test_slot', $endpos, 10,
'include-xids' => '0',