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Fix race in test of pg_switch_wal().

The test failed when something added WAL between pg_switch_wal() andpg_current_wal_lsn(), seen on buildfarm members hornet and sungazer.Fix v10, v9.6 and v9.5 by making this code mirror its v13+ counterpart.v12 and v11 lack a counterpart.

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src/test/recovery/t
- 020_archive_status.pl

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`‎src/test/recovery/t/020_archive_status.pl`

Lines changed: 6 additions & 4 deletions

Original file line number	Diff line number	Diff line change
`@@ -141,12 +141,14 @@`
`141`	`141`	`'postgres',q{`
`142`	`142`	`INSERT INTO mine SELECT generate_series(21,30) AS x;`
`143`	`143`	`CHECKPOINT;`
`144`		`-SELECT pg_switch_wal();`
`145`	`144`	`});`
`146`	`145`
`147`		`-# Make sure that the standby has caught here.`
`148`		`-my$primary_lsn =$primary->safe_psql('postgres',`
`149`		`-q{SELECT pg_current_wal_lsn()});`
	`146`	`+# Switch to a new segment and use the returned LSN to make sure that the`
	`147`	`+# standby has caught up to this point.`
	`148`	`+my$primary_lsn =$primary->safe_psql(`
	`149`	`+'postgres',q{`
	`150`	`+SELECT pg_switch_wal();`
	`151`	`+});`
`150`	`152`	`$standby1->poll_query_until('postgres',`
`151`	`153`	`qq{ SELECT pg_wal_lsn_diff(pg_last_wal_replay_lsn(), '$primary_lsn') >= 0},`
`152`	`154`	`'t')`

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Commitb6a5b76

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`‎src/test/recovery/t/020_archive_status.pl`

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