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

58293873 · Simon Riggs · 773b5e0e · 58293873
Commit 58293873 authored May 09, 2012 by Simon Riggs
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src/backend/utils/adt/xid.c src/backend/utils/adt/xid.c +4 -1

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--- 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))