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Commit12e41a5

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Reset pg_stat_activity.xact_start during PREPARE TRANSACTION.
Once we've completed a PREPARE, our session is not running a transaction,so its entry in pg_stat_activity should show xact_start as null, ratherthan leaving the value as the start time of the now-prepared transaction.I think possibly this oversight was triggered by faulty extrapolationfrom the adjacent comment that says PrepareTransaction should not callAtEOXact_PgStat, so tweak the wording of that comment.Noted by Andres Freund while considering bug #10123 from Maxim Boguk,although this error doesn't seem to explain that report.Back-patch to all active branches.
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‎src/backend/access/transam/xact.c‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2233,8 +2233,9 @@ PrepareTransaction(void)
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AtEOXact_Files();
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AtEOXact_ComboCid();
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AtEOXact_HashTables(true);
2236-
/* don't call AtEOXact_PgStat here */
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/* don't call AtEOXact_PgStat here; we fixed pgstat state above */
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AtEOXact_Snapshot(true);
2238+
pgstat_report_xact_timestamp(0);
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CurrentResourceOwner=NULL;
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ResourceOwnerDelete(TopTransactionResourceOwner);

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