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Fix pg_recvlogical avoidance of superfluous Standby Status Update.

The defect suppressed a Standby Status Update message when bytes flushedto disk had changed but bytes received had not changed. Ifpg_recvlogical then exited with no intervening Standby Status Update,the next pg_recvlogical repeated already-flushed records. The defectcould also cause superfluous messages, which are functionally harmless.Back-patch to 9.5 (all supported versions).Discussion:https://postgr.es/m/20200502221647.GA3941274@rfd.leadboat.com

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src/bin/pg_basebackup
- pg_recvlogical.c

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`‎src/bin/pg_basebackup/pg_recvlogical.c`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -126,7 +126,7 @@ sendFeedback(PGconn *conn, TimestampTz now, bool force, bool replyRequested)`
`126`	`126`	`*/`
`127`	`127`	`if (!force&&`
`128`	`128`	`last_written_lsn==output_written_lsn&&`
`129`		`-last_fsync_lsn!=output_fsync_lsn)`
	`129`	`+last_fsync_lsn==output_fsync_lsn)`
`130`	`130`	`return true;`
`131`	`131`
`132`	`132`	`if (verbose)`

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Commitcee9cad

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`‎src/bin/pg_basebackup/pg_recvlogical.c`

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