Avoid xid error from age() function when run on Hot Standby

2012-05-09 13:56:24 +01:00 · 2012-05-09 13:56:24 +01:00 · 5829387381
parent 773b5e0efa
commit 5829387381
1 changed files with 4 additions and 1 deletions
--- a/src/backend/utils/adt/xid.c
+++ b/src/backend/utils/adt/xid.c
@ -93,7 +93,10 @@ Datum
 xid_age(PG_FUNCTION_ARGS)
 {
 	TransactionId xid = PG_GETARG_TRANSACTIONID(0);
-	TransactionId now = GetTopTransactionId();
+	TransactionId now = GetTopTransactionIdIfAny();
+
+	if (!TransactionIdIsValid(now))
+		now = ReadNewTransactionId();

 	/* Permanent XIDs are always infinitely old */
 	if (!TransactionIdIsNormal(xid))