Revert back-branch changes in behavior of age(xid).

Per discussion, it does not seem like a good idea to change the behavior of
age(xid) in a minor release, even though the old definition causes the
function to fail on hot standby slaves.  Therefore, revert commit
5829387381d2e4edf84652bb5a712f6185860670 and follow-on commits in the back
branches only.

1 files changed, 0 insertions, 24 deletions

diff --git a/src/backend/access/transam/xact.c b/src/backend/access/transam/xact.c
index 511e17c2e45..33431585d86 100644
--- a/src/backend/access/transam/xact.c
+++ b/src/backend/access/transam/xact.c
@@ -386,30 +386,6 @@ GetCurrentTransactionIdIfAny(void)
 	return CurrentTransactionState->transactionId;
 }
 
-/*
- *	GetStableLatestTransactionId
- *
- * Get the XID once and then return same value for rest of transaction.
- * Acts as a useful reference point for maintenance tasks.
- */
-TransactionId
-GetStableLatestTransactionId(void)
-{
-	static LocalTransactionId lxid = InvalidLocalTransactionId;
-	static TransactionId stablexid = InvalidTransactionId;
-
-	if (lxid != MyProc->lxid)
-	{
-		lxid = MyProc->lxid;
-		stablexid = GetTopTransactionIdIfAny();
-		if (!TransactionIdIsValid(stablexid))
-			stablexid = ReadNewTransactionId();
-	}
-
-	Assert(TransactionIdIsValid(stablexid));
-
-	return stablexid;
-}
 
 /*
  * AssignTransactionId